JP3233469B2 - Non-aqueous electrolyte battery - Google Patents
Non-aqueous electrolyte batteryInfo
- Publication number
- JP3233469B2 JP3233469B2 JP33770292A JP33770292A JP3233469B2 JP 3233469 B2 JP3233469 B2 JP 3233469B2 JP 33770292 A JP33770292 A JP 33770292A JP 33770292 A JP33770292 A JP 33770292A JP 3233469 B2 JP3233469 B2 JP 3233469B2
- Authority
- JP
- Japan
- Prior art keywords
- lid
- ptc element
- inner lid
- annular portion
- aqueous electrolyte
- 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 - Lifetime
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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Description
【０００１】[0001]
【産業上の利用分野】本発明、防爆機能を兼ねる封口蓋
体を備えた非水電解液電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nonaqueous electrolyte battery provided with a sealing lid which also has an explosion-proof function.
【０００２】[0002]
【従来の技術】最近、非水電解液を使用したリチウム電
池やリチウムイオン電池等の非水電解液を用いた二次電
池が携帯電子機器等に広く使用されつつある。このよう
な二次電池は、従来の電池とは異なり、３Ｖ、４Ｖとい
った高い起電力を有するという特徴があり、その優れた
性能が注目されている。2. Description of the Related Art Recently, secondary batteries using a non-aqueous electrolyte such as a lithium battery and a lithium ion battery using a non-aqueous electrolyte have been widely used in portable electronic devices and the like. Unlike a conventional battery, such a secondary battery is characterized by having a high electromotive force of 3 V or 4 V, and its excellent performance has attracted attention.
【０００３】ところで、前述した二次電池は、外装缶内
に収納された正極および負極を備える電極体が化学変化
を起こして内圧が高くなり、破裂を生じる場合がある。
例えば、リチウム二次電池のような非水電解液電池に通
常以上の電流を与える、いわゆる過充電状態にしたり、
誤使用により短絡状態になって大電流が流れたりすると
前記電極体の中の非水電解液が分解されてガスが発生す
る場合がある。このようなガスが前記外装缶内に次第に
充満し、外装缶内の内圧が上昇すると、最後には電池が
破裂する。In the above-described secondary battery, an electrode body having a positive electrode and a negative electrode housed in an outer can may undergo a chemical change to increase the internal pressure and cause a burst.
For example, a non-aqueous electrolyte battery such as a lithium secondary battery is supplied with a current higher than usual, or in a so-called overcharged state,
If a short circuit occurs due to misuse and a large current flows, the non-aqueous electrolyte in the electrode body may be decomposed to generate gas. Such a gas gradually fills the outer can, and when the internal pressure in the outer can increases, the battery eventually bursts.
【０００４】このようなことから、従来では前述した電
池の破裂を防止するために図２に示すように防爆機能お
よび端子を兼ねた封口蓋群を備えた非水電解液電池が知
られている。すなわち、負極端子を兼ねる外装缶２１内
には電極体２２が収納されている。前記電極体２２は、
正極２３、セパレータ２４および負極２５の積層物を渦
巻状に巻回した構成になっている。なお、前記電極体２
２の外周に配置された前記セパレータ２４の部分には切
欠部２６が形成され、前記負極端子を兼ねる外装缶２１
と前記切欠部２６から露出した前記負極２５と電気的に
接触している。中央に穴を有する絶縁板２７は、前記外
装缶２１の底部に配置され、前記電極体２２の前記正極
２３が前記負極端子を兼ねる外装缶２１と電気的に接触
するのを防止している。防爆機能および端子を兼ねる封
口蓋群２８は、前記外装缶２１の上端開口部に絶縁ガス
ケット２９を介してカシメ固定されている。前記封口蓋
群２８は、前記電極体２２と対向して配置された皿状の
内部蓋体３０と、前記内部蓋体３０上に可撓性薄膜から
形成された弁膜３１を介して配置され、前記内部蓋体３
０周縁を内側に折り曲げて形成した円環状部３２により
挟持された絶縁材料からなる補強板３３と、前記内部蓋
体３０の前記円環状部３２上に配置されたＰＴＣ素子３
４と、前記ＰＴＣ素子３４上に周縁部を当接して配置さ
れた帽子形の外部蓋体３５とから構成されている。前記
内部蓋体３０、前記補強板３３、前記ＰＴＣ素子３４お
よび前記外部蓋体３５には、それぞれガス抜き孔３６、
３７、３８、３９が開口されている。正極リード４０
は、一端が前記電極体２２の正極２３に接続され、他端
が前記封口蓋群２８の前記内部蓋体３０の下面に接続さ
れている。For this reason, a non-aqueous electrolyte battery having an explosion-proof function and a group of sealing lids having terminals as shown in FIG. 2 is known in the prior art in order to prevent the above-mentioned battery from exploding. . That is, the electrode body 22 is housed in the outer can 21 also serving as the negative electrode terminal. The electrode body 22 includes:
The laminate of the positive electrode 23, the separator 24, and the negative electrode 25 is spirally wound. The electrode body 2
A notch 26 is formed in the portion of the separator 24 arranged on the outer periphery of the outer can 2, and the outer can 21 serving also as the negative electrode terminal is formed.
And the negative electrode 25 exposed from the notch 26. An insulating plate 27 having a hole in the center is disposed at the bottom of the outer can 21 to prevent the positive electrode 23 of the electrode body 22 from making electrical contact with the outer can 21 also serving as the negative electrode terminal. A group of sealing lids 28 having both an explosion-proof function and a terminal is caulked and fixed to the upper end opening of the outer can 21 via an insulating gasket 29. The sealing lid group 28 is disposed via a dish-shaped inner lid 30 disposed to face the electrode body 22 and a valve membrane 31 formed of a flexible thin film on the inner lid 30, The inner lid 3
A reinforcing plate 33 made of an insulating material sandwiched by an annular portion 32 formed by bending the 0 peripheral edge inward, and a PTC element 3 disposed on the annular portion 32 of the inner lid 30.
4 and a hat-shaped outer lid 35 arranged on the PTC element 34 with its peripheral edge abutting. The inner lid 30, the reinforcing plate 33, the PTC element 34, and the outer lid 35 have gas vent holes 36, respectively.
37, 38 and 39 are open. Positive electrode lead 40
Has one end connected to the positive electrode 23 of the electrode body 22 and the other end connected to the lower surface of the inner lid body 30 of the sealing lid group 28.
【０００５】このような構成の非水電解液電池におい
て、通常以上の電流、例えば過充電状態により大電流が
与えられると、前記内部蓋体３０と前記外部蓋体３５と
の間に位置する前記ＰＴＣ素子３４の抵抗が温度上昇に
伴って急激に増加し、電流を流さなくすることにより電
池の破裂が防止される。また、前記電極体２２および非
水電解液が収納された外装缶２１内に前記大電流により
分解ガスが発生して内圧が上昇し、所定の圧力に達する
と、前記分解ガスは前記内部蓋体３０に開口されたガス
抜き孔３６を通してそのガス抜き孔３６の上方に配置さ
れた前記弁膜３１を破断する。その結果、前記分解ガス
は前記弁膜３１の破断個所、前記補強板３３、前記ＰＣ
Ｔ素子３４および前記外部蓋体３５にそれぞれ開口され
たガス抜き孔３７、３８、３９を通して外部に逃散し、
電池の破裂が未然に防止される。In the non-aqueous electrolyte battery having such a configuration, when a current higher than usual, for example, a large current is applied due to an overcharged state, the above-described non-aqueous electrolyte battery located between the inner lid 30 and the outer lid 35 is placed. The resistance of the PTC element 34 sharply increases as the temperature rises, and by preventing the current from flowing, the battery is prevented from exploding. When the large current generates a decomposed gas in the outer can 21 containing the electrode body 22 and the non-aqueous electrolyte, the decomposed gas is increased and reaches a predetermined pressure. The valve membrane 31 disposed above the gas vent hole 36 is broken through the gas vent hole 36 opened in 30. As a result, the decomposed gas flows through the rupture portion of the valve membrane 31, the reinforcing plate 33, and the PC.
The gas escapes to the outside through gas vent holes 37, 38, and 39 opened in the T element 34 and the outer lid 35, respectively.
The battery is prevented from being ruptured.
【０００６】しかしながら、前述した従来の防爆機能お
よび端子を兼ねる封口蓋群２８を備えた非水電解液電池
では前記内部蓋体３０の前記環状部３２によりその上に
配置された前記ＰＴＣ素子３４が局部的に加圧されるた
め、前記ＰＴＣ素子３４が持つ温度上昇に伴って急激に
抵抗値が増大する特性が損なわれる。その結果、通常以
上の電流、例えば過充電状態により大電流が与えられ
も、前記ＰＴＣ素子３４が良好に作動せず、急激に流れ
る電流を良好に遮断できないため、前記外装缶２１の内
圧が急激にた高まって電池が破裂するという問題があっ
た。However, in the above-described conventional non-aqueous electrolyte battery provided with a group of sealing lids 28 which also serves as an explosion-proof function and a terminal, the PTC element 34 disposed thereon by the annular portion 32 of the inner lid 30 is not used. Since the pressure is locally applied, the characteristic that the resistance value of the PTC element 34 suddenly increases with a rise in temperature is impaired. As a result, the PTC element 34 does not operate well even if a large current is applied due to a current higher than normal, for example, due to an overcharged state, and a rapid flowing current cannot be cut off satisfactorily. And the battery explodes.
【０００７】[0007]
【発明が解決しようとする課題】本発明の目的は、過充
電時や短絡時に起きる急激な電流増大を封口蓋群を構成
するＰＴＣ素子により良好に遮断することが可能な非水
電解液電池を提供しようとするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a non-aqueous electrolyte battery capable of satisfactorily shutting off a sudden increase in current at the time of overcharging or short-circuiting by a PTC element constituting a sealing lid group. It is something to offer.
【０００８】[0008]
【課題を解決するための手段】本発明に係る非水電解液
電池は、外装缶と、前記外装缶内に収納され、正極、セ
パレータおよび負極を渦巻き状に巻回した電極体と、前
記外装缶内に収容された非水電解液と、前記外装缶の上
端開口部に絶縁ガスケットにより気密にカシメ固定され
た防爆機能および端子を兼ねる封口蓋群とを具備し、前
記封口蓋群は、前記電極体と対向して配置された内部蓋
体と、この内部蓋体上に前記外装缶内で発生した分解ガ
スの圧力のみで破断される弁膜を介して配置され、前記
内部蓋体周縁を内側に折り曲げて形成した環状部により
挟持された補強板と、前記内部蓋体の環状部上に配置さ
れたＰＴＣ素子と、このＰＴＣ素子上に周縁部を当接し
て配置された外部蓋体と、前記内部蓋体、前記補強板、
前記ＰＴＣ素子および前記外部蓋体にそれぞれ開口され
たガス抜き孔とから構成され、前記内部蓋体の前記環状
部の開口は、前記ＰＴＣ素子の前記ガス抜き孔と一致す
るか、または前記ガス抜き孔より内側に位置することを
特徴とするものである。A non-aqueous electrolyte battery according to the present invention comprises an outer can, an electrode body housed in the outer can, in which a positive electrode, a separator and a negative electrode are spirally wound; A non-aqueous electrolyte contained in a can, and a sealing lid group serving also as an explosion-proof function and a terminal air-tightly fixed with an insulating gasket at an upper end opening of the outer can, and the sealing lid group includes the sealing lid group, An inner lid disposed opposite to the electrode body, disposed on the inner lid via a valve membrane that is broken only by the pressure of the decomposition gas generated in the outer can, and the inner lid peripheral edge is positioned inside. A reinforcing plate sandwiched between annular portions formed by bending the PTC element, a PTC element disposed on the annular portion of the inner lid, and an outer lid disposed on the PTC element with a peripheral portion in contact therewith. The inner lid, the reinforcing plate,
The PTC element and a gas vent hole respectively opened in the outer lid, wherein the opening of the annular portion of the inner lid coincides with the gas vent hole of the PTC element or the gas vent. It is characterized by being located inside the hole.
【０００９】前記内部蓋体の前記環状部の開口位置を前
記ＰＴＣ素子の前記ガス抜き孔位置と一致させるか、ま
たは前記ガス抜き孔より内側にしたことを特徴とするも
のである。以下、本発明に係わる非水電解液電池を図１
を参照して詳細に説明する。[0009] The position of the opening of the annular portion of the inner lid may coincide with the position of the gas vent hole of the PTC element, or may be located inside the gas vent hole. FIG. 1 shows a non-aqueous electrolyte battery according to the present invention.
This will be described in detail with reference to FIG.
【００１０】例えば負極端子を兼ねる有底円筒形の外装
缶１内には、電極体２が収納されている。前記電極体２
は、正極３、セパレータ４および負極５の積層物を渦巻
状に巻回した構成になっている。なお、前記電極体２の
外周に配置された前記セパレータ４の部分には切欠部６
が形成され、前記負極端子を兼ねる外装缶１と前記切欠
部６から露出した前記負極５と電気的に接触している。
中央に穴を有する絶縁板７は、前記外装缶１の底部に配
置され、前記電極体２の前記正極３が前記負極端子を兼
ねる外装缶１と電気的に接触するのを防止している。For example, an electrode body 2 is housed in a bottomed cylindrical outer can 1 also serving as a negative electrode terminal. The electrode body 2
Has a configuration in which a laminate of the positive electrode 3, the separator 4, and the negative electrode 5 is spirally wound. A notch 6 is formed in a portion of the separator 4 arranged on the outer periphery of the electrode body 2.
Are formed, and are electrically in contact with the outer can 1 also serving as the negative electrode terminal and the negative electrode 5 exposed from the notch 6.
An insulating plate 7 having a hole in the center is disposed at the bottom of the outer can 1 to prevent the positive electrode 3 of the electrode body 2 from being in electrical contact with the outer can 1 also serving as the negative electrode terminal.
【００１１】防爆機能および端子を兼ねる封口蓋群８
は、前記外装缶１の上端開口部に絶縁ガスケット９を介
してカシメ固定されている。前記封口蓋群８は、前記電
極体２と対向して配置された皿状の内部蓋体１０と、前
記内部蓋体１０上に可撓性薄膜から形成された弁膜１１
を介して配置され、前記内部蓋体１０周縁を内側に折り
曲げて形成した円環状部１２により挟持された絶縁材料
からなる補強板１３と、前記内部蓋体１０の円環状部１
２上に配置されたＰＴＣ素子１４と、前記ＰＴＣ素子１
４上に周縁部を当接して配置された帽子形の外部蓋体１
５とから構成されている。前記内部蓋体１０、前記補強
板１３、前記ＰＴＣ素子１４および前記外部蓋体１５に
は、それぞれガス抜き孔１６、１７、１８、１９が開口
されている。正極リード２０は、一端が前記電極体２の
正極３に接続され、他端が前記封口蓋群８の前記内部蓋
体１０の下面に接続されている。A group of sealing lids 8 having both an explosion-proof function and a terminal
Is caulked and fixed to the upper end opening of the outer can 1 via an insulating gasket 9. The sealing lid group 8 includes a dish-shaped inner lid 10 arranged to face the electrode body 2 and a valve membrane 11 formed on the inner lid 10 from a flexible thin film.
And a reinforcing plate 13 made of an insulating material sandwiched by an annular portion 12 formed by bending a peripheral edge of the inner lid 10 inward, and an annular portion 1 of the inner lid 10.
PTC element 14 disposed on the PTC element 2 and the PTC element 1
Hat-shaped outer lid 1 arranged on the peripheral edge portion 4
And 5. The inner lid 10, the reinforcing plate 13, the PTC element 14, and the outer lid 15 are provided with vent holes 16, 17, 18, and 19, respectively. One end of the positive electrode lead 20 is connected to the positive electrode 3 of the electrode body 2, and the other end is connected to the lower surface of the inner lid 10 of the sealing lid group 8.
【００１２】前記封口蓋群８を構成する前記内部蓋体１
０の前記円環状部１２の開口位置は、前記ＰＴＣ素子１
４の前記ガス抜き孔１８位置より内側にしてある。つま
り、前記円環状部１２の面積は前記ガス抜き孔１８を有
する前記ＰＴＣ素子１４の面積より大きくして前記ＰＴ
Ｃ素子１４全体が前記円環状部１２の上に配置されるよ
うにしてある。ただし、前記内部蓋体１０の前記円環状
部１２の開口位置は、前記ＰＴＣ素子１４の前記ガス抜
き孔１８位置と一致させて、前記円環状部１２の面積と
前記ガス抜き孔１８を有する前記ＰＴＣ素子１４の面積
と同じにしてもよい。The internal lid 1 constituting the sealing lid group 8
0 of the PTC element 1
4 is located inside the position of the gas vent hole 18. That is, the area of the annular portion 12 is made larger than the area of the PTC element 14 having the gas vent hole 18 so that the PT
The entire C element 14 is arranged on the annular portion 12. However, the position of the opening of the annular portion 12 of the inner lid 10 coincides with the position of the gas vent hole 18 of the PTC element 14 so that the area of the annular portion 12 and the gas vent hole 18 are provided. The area may be the same as the area of the PTC element 14.
【００１３】前記円環状部１２の開口面積は、前記外装
缶１内に発生した分解ガスを外部に良好に逃散させる観
点から電池容量（Ａｈ）当たり０．１〜１．２ｃｍ2 の
範囲にすることが望ましい。前記弁膜１１は、Ａｌなど
の金属薄膜と合成樹脂薄膜を積層した複合膜を用いるこ
とが好ましい。The opening area of the annular portion 12 is 0.1 to 1.2 cm 2 per battery capacity (Ah) from the viewpoint of allowing the decomposition gas generated in the outer can 1 to escape well to the outside. It is desirable to be within the range. As the valve film 11, it is preferable to use a composite film in which a thin metal film such as Al and a thin synthetic resin film are laminated.
【００１４】前記電極体２の巻芯空間部には、分解ガス
の流通経路になる前記巻芯空間部の潰れを防止する目的
でステンレスなどの金属またはプラスチックからなるパ
イプを配置することを許容する。なお、前記環状部は円
環状に限らず、外装缶１の外形に合った形状、例えば矩
形環状にしてもよい。In the core space of the electrode body 2, a pipe made of a metal such as stainless steel or a plastic is allowed to be disposed for the purpose of preventing the core space serving as a flow path of the decomposition gas from being crushed. . The annular portion is not limited to an annular shape, and may have a shape that matches the outer shape of the outer can 1, for example, a rectangular annular shape.
【００１５】[0015]
【作用】本発明に係わる非水電解液電池は、内部蓋体１
０の円環状部１２の開口位置とＰＴＣ素子１４のガス抜
き孔１８位置と一致させるか、または前記ガス抜き孔１
８位置より内側にした構造の封口蓋群８を外装缶１に絶
縁ガスケット９を介して取付けた構成になっているた
め、前記ＰＴＣ素子１４を良好に作動させることができ
る。The non-aqueous electrolyte battery according to the present invention has an inner lid 1
0 or the position of the vent hole 18 of the PTC element 14 or the position of the vent hole 1
Since the sealing lid group 8 having a structure located inside from the eight positions is attached to the outer can 1 via the insulating gasket 9, the PTC element 14 can be operated satisfactorily.
【００１６】すなわち、従来の非水電解液電池は図２に
示すように内部蓋体３０の円環状部３２の開口位置がＰ
ＴＣ素子３４のガス抜き孔３８位置より外側にある、つ
まり円環状部３２の面積が前記ガス抜き孔３８を有する
ＰＴＣ素子３４の面積に比べて遥かに小さく、前記ＰＴ
Ｃ素子３４の周縁付近のみが前記円環状部３２上に配置
されることになる。このため、前記内部蓋体３０、ＰＴ
Ｃ素子３４などを備える封口蓋群２８を絶縁ガスケット
２９を介して外装缶２１にカシメ固定すると、前記内部
蓋体３０の前記円環状部３２によりその上に周縁付近の
み配置された前記ＰＴＣ素子３４が局部的に加圧され
て、前記ＰＴＣ素子３４が持つ温度上昇に伴って急激に
抵抗値が増大する特性が損なわれる。That is, in the conventional nonaqueous electrolyte battery, as shown in FIG.
The area outside the position of the gas vent hole 38 of the TC element 34, that is, the area of the annular portion 32 is much smaller than the area of the PTC element 34 having the gas vent hole 38,
Only the periphery of the C element 34 is arranged on the annular portion 32. For this reason, the inner lid 30, PT
When the sealing lid group 28 including the C element 34 and the like is caulked and fixed to the outer can 21 via an insulating gasket 29, the PTC element 34 disposed only in the vicinity of the periphery on the annular portion 32 of the inner lid 30 is provided thereon. Is locally pressurized, and the characteristic that the resistance value of the PTC element 34 suddenly increases with a rise in temperature is impaired.
【００１７】このようなことから、本発明のように内部
蓋体１０の円環状部１２の開口位置とＰＴＣ素子１４の
ガス抜き孔１８位置と一致させるか、または前記ガス抜
き孔１８位置より内側にして、前記ＰＴＣ素子１４全体
が前記円環状部１２の上に配置する構成にすることによ
って、前記内部蓋体１０、ＰＴＣ素子１４などを備える
封口蓋群８を絶縁ガスケット９を介して外装缶２１にカ
シメ固定する際、前記内部蓋体１０の前記円環状部１２
によりその上に配置された前記ＰＴＣ素子１４が局部的
に加圧されのを解消できるため、前記ＰＴＣ素子１４が
持つ温度上昇に伴って急激に抵抗値が増大する特性を良
好に維持できる。したがって、通常以上の電流、例えば
過充電状態により大電流が与えられるても、前記内部蓋
体１０と前記外部蓋体１５との間に位置する前記ＰＴＣ
素子１４が良好に作動して抵抗値が温度上昇に伴って急
激に増加し、電流を確実に遮断できるため、内圧の急激
な上昇を回避し、電池の破裂を防止することができる。Therefore, as in the present invention, the opening position of the annular portion 12 of the inner lid 10 and the position of the gas vent hole 18 of the PTC element 14 coincide with each other, or Then, the entire PTC element 14 is arranged on the annular portion 12 so that the sealing lid group 8 including the inner lid 10, the PTC element 14, etc. When caulking is fixed to 21, the annular portion 12 of the inner lid 10 is
Accordingly, the PTC element 14 disposed thereon can be prevented from being locally pressurized, so that the characteristic that the resistance value of the PTC element 14 suddenly increases with a rise in temperature can be favorably maintained. Therefore, even if a current larger than usual, for example, a large current is applied due to an overcharged state, the PTC located between the inner lid 10 and the outer lid 15
Since the element 14 operates well and the resistance value rapidly increases with the rise in temperature and the current can be reliably shut off, a rapid increase in the internal pressure can be avoided and the battery can be prevented from exploding.
【００１８】また、前記外装缶１内に発生した分解ガス
は前記内部蓋体１０のガス抜き孔１６を通して前記内部
蓋体１０上に配置された弁膜１１を良好に加圧して破断
できると共に、前記分解ガスは前記弁膜１１の破断個
所、前記補強板１３、前記ＰＣＴ素子１４および前記外
部蓋体１５にそれぞれ開口された前記ガス抜き孔１７、
１８、１９を通して外部に円滑に逃散でき、電池の破裂
および発火等を未然に防止することができる。Decomposed gas generated in the outer can 1 can satisfactorily press the valve membrane 11 disposed on the inner lid 10 through the gas vent hole 16 of the inner lid 10 to break the valve membrane. The decomposed gas is provided at the rupture portion of the valve membrane 11, the reinforcing plate 13, the PCT element 14, and the gas vent holes 17, which are respectively opened in the external lid 15,
It is possible to smoothly escape to the outside through 18 and 19, and it is possible to prevent rupture and ignition of the battery.
【００１９】[0019]
【実施例】以下、本発明の実施例を前述した図１を参照
して詳細に説明する。 実施例１An embodiment of the present invention will be described below in detail with reference to FIG. Example 1
【００２０】リチウムとコバルトの複合酸化物（ＬｉＣ
ｏＯ2 ）に導電剤、バインダを加えて調製した正極合剤
をアルミニウム基板に塗布し、乾燥してシート状の正極
を作製した。リチウムを担持した炭素質物にバインダを
添加した負極合剤をステンレス基板に塗布、乾燥してシ
ート状の負極を作製した。前記シート状の正極および負
極の間にポリプロピレン製多孔質フィルムからなるセパ
レータを挟んで積層物を作製し、前記積層物を外径４ｍ
ｍ、内径２．１１ｍｍのステンレス製バイプ（開口面積
０．０３４９ｃｍ2 ）を巻芯として渦巻状に巻回するこ
とにより電極体を製造した。A composite oxide of lithium and cobalt (LiC
A positive electrode mixture prepared by adding a conductive agent and a binder to oO 2 ) was applied to an aluminum substrate and dried to prepare a sheet-shaped positive electrode. A negative electrode mixture obtained by adding a binder to a carbonaceous material carrying lithium was applied to a stainless steel substrate and dried to produce a sheet-shaped negative electrode. A laminate was prepared by sandwiching a separator made of a porous film made of polypropylene between the sheet-like positive electrode and the negative electrode, and the laminate was made to have an outer diameter of 4 m.
m, stainless steel pipe with an inner diameter of 2.11 mm (open area 0.0349 cm 2 ) Was wound in a spiral around a core to produce an electrode body.
【００２１】次いで、ステンレス製の有底円筒形の外装
缶内に前記電極体を収納し、プロピレンカーボネートと
ジメトキシエタンとの混合溶媒（体積比率５０：５０）
にリンフッ化酸リチウム（ＬｉＰＦ6 ）を１モル／ｌ溶
解した電解液を収容した。つづいて、防爆機能および正
極端子を兼ねる封口蓋群の内部蓋体と前記外装缶内に収
納した電極体の正極とを正極リードで接続し、前記封口
蓋群を前記外装缶の上端開口部に絶縁ガスケットを介し
て気密にカシメ固定することにより図１に示す構造（巻
芯は図示せず）を有し、外径１７ｍｍ、総高さ５０ｍ
ｍ、容量が７５０ｍＡｈの円筒形非水電解液電池を組み
立てた。なお、前記封口蓋群８を構成する内部蓋体１０
の円環状部１２の開口径は８ｍｍ、前記円環状部１２上
に配置されるＰＴＣ素子１４のガス抜き孔１８の径は、
８．９ｍｍとし、前記円環状部１２の開口位置を前記Ｐ
ＴＣ素子１４のガス抜き孔１８位置より内側し、前記Ｐ
ＴＣ素子１４全体が前記円環状部１２上に配置されるよ
うにした。 比較例１Next, the electrode body is housed in a stainless steel bottomed cylindrical outer can, and a mixed solvent of propylene carbonate and dimethoxyethane (volume ratio: 50:50).
An electrolyte solution containing 1 mol / l of lithium phosphofluoride (LiPF 6 ) was accommodated therein. Subsequently, the inner lid of the sealing lid group also serving as an explosion-proof function and a positive electrode terminal and the positive electrode of the electrode body housed in the outer can are connected with a positive electrode lead, and the sealing lid group is connected to the upper end opening of the outer can. The structure shown in FIG. 1 (the winding core is not shown) is secured by airtightly caulking through an insulating gasket, and has an outer diameter of 17 mm and a total height of 50 m.
m, a cylindrical non-aqueous electrolyte battery having a capacity of 750 mAh was assembled. In addition, the inner lid 10 constituting the sealing lid group 8
The opening diameter of the annular portion 12 is 8 mm, and the diameter of the gas vent hole 18 of the PTC element 14 disposed on the annular portion 12 is:
8.9 mm, and the opening position of the annular portion 12 is
The inner side of the vent hole 18 of the TC element 14
The entire TC element 14 is arranged on the annular portion 12. Comparative Example 1
【００２２】封口蓋群を構成する内部蓋体の円環状部の
開口径を１３．８ｍｍ、前記円環状部上に配置されるＰ
ＴＣ素子のガス抜き孔の径を８．９ｍｍとし、前記ＰＴ
Ｃ素子の周縁付近のみが前記円環状部上に配置されるよ
うにした以外、実施例１と同様な構成の円筒形非水電解
液電池を組み立てた。The opening diameter of the annular portion of the inner lid constituting the closing lid group is 13.8 mm, and P is disposed on the annular portion.
The diameter of the vent hole of the TC element was 8.9 mm, and the PT
A cylindrical non-aqueous electrolyte battery having the same configuration as in Example 1 was assembled except that only the periphery of the C element was arranged on the annular portion.
【００２３】得られた実施例１および比較例１の電池２
５個について、０．５Ａ、１．５Ａ、２Ａおよび３．５
Ａの電流を２４時間流す過充電試験を行って破裂した電
池の個数を調べた。その結果、下記表１に示す。 表１ ０．５Ａ １．５Ａ ２Ａ ３．５Ａ 実施例１ 0/25 0/25 0/25 0/25 比較例１ 0/25 1/25 2/25 7/25Battery 2 of Example 1 and Comparative Example 1 obtained
0.5A, 1.5A, 2A and 3.5 for 5
An overcharge test in which the current of A was passed for 24 hours was performed to determine the number of ruptured batteries. The results are shown in Table 1 below. Table 1 0.5A 1.5A 2A 3.5A Example 1 0/25 0/25 0/25 0/25 Comparative Example 1 0/25 1/25 2/25 7/25
【００２４】前記表１から明らかなように実施例１の電
池では比較例１の電池に比べて高い安全性を有すること
がわかる。特に、過充電時の電流が高い場合において実
施例１の電池は優れた安全性を有することがわかる。As is clear from Table 1, the battery of Example 1 has higher safety than the battery of Comparative Example 1. In particular, it can be seen that the battery of Example 1 has excellent safety when the current during overcharge is high.
【００２５】なお、前記実施例では円筒形の非水電解液
電池に適用した例を説明したが、コイン形、角形、楕円
形など各種の形状の非水電解液電池にも同様に適用する
ことができる。In the above embodiment, an example in which the present invention is applied to a cylindrical non-aqueous electrolyte battery is described. However, the present invention is similarly applied to non-aqueous electrolyte batteries having various shapes such as a coin shape, a square shape, and an elliptical shape. Can be.
【００２６】[0026]
【発明の効果】以上詳述しように、本発明によれば封口
蓋群を構成するＰＴＣ素子への局部的な加圧を解消する
ことによりＰＴＣ素子を良好に作動でき、過充電時、短
絡時の安全性を確保し得る非水電解液電池を提供でき
る。As described above in detail, according to the present invention, the PTC element constituting the sealing lid group can be satisfactorily operated by eliminating the local pressurization to the PTC element. A non-aqueous electrolyte battery that can ensure the safety of the battery can be provided.
【図１】本発明に係わる円筒形非水電解液電池を示す断
面図。FIG. 1 is a sectional view showing a cylindrical nonaqueous electrolyte battery according to the present invention.
【図２】従来の円筒形非水電解液電池を示す断面図。FIG. 2 is a sectional view showing a conventional cylindrical nonaqueous electrolyte battery.
１…外装缶、２…電極体、３…正極、５…負極、８…封
口蓋群、９…絶縁ガスケット １０…内部電極、１１…弁膜、１２…円環状部、１４…
ＰＴＣ素子、１５…外部蓋体、１６、１７、１８、１９
…ガス抜き孔。DESCRIPTION OF SYMBOLS 1 ... Outer can, 2 ... Electrode body, 3 ... Positive electrode, 5 ... Negative electrode, 8 ... Sealing lid group, 9 ... Insulating gasket 10 ... Internal electrode, 11 ... Valve membrane, 12 ... Annular part, 14 ...
PTC element, 15 ... external lid, 16, 17, 18, 19
... Vent holes.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 能勢 博義 東京都品川区南品川３丁目４番10号 東 芝電池株式会社内 (72)発明者 松坂 英二郎 神奈川県川崎市川崎区夜光１丁目３番１ 号 旭化成工業株式会社内 (72)発明者 井上 克彦 神奈川県川崎市川崎区夜光１丁目３番１ 号 旭化成工業株式会社内 (56)参考文献 実開 平２−150661（ＪＰ，Ｕ) 実開 平２−50957（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 2/34 H01M 2/12 H01M 10/40 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroyoshi Nose 3-4-1-10 Minamishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Battery Co., Ltd. (72) Eijiro Matsuzaka 1-3-3 Nightlight, Kawasaki-ku, Kawasaki-ku, Kanagawa Prefecture No. 1 In Asahi Kasei Kogyo Co., Ltd. (72) Inventor Katsuhiko Inoue 1-3-1 Yoko, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Asahi Kasei Kogyo Co., Ltd. (56) References Real Opening 2-150661 (JP, U) Hei 2-50957 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H01M 2/34 H01M 2/12 H01M 10/40
Claims (1)
極、セパレータおよび負極を渦巻き状に巻回した電極体
と、前記外装缶内に収容された非水電解液と、前記外装
缶の上端開口部に絶縁ガスケットにより気密にカシメ固
定された防爆機能および端子を兼ねる封口蓋群とを具備
し、 前記封口蓋群は、前記電極体と対向して配置された内部
蓋体と、この内部蓋体上に前記外装缶内で発生した分解
ガスの圧力のみで破断される弁膜を介して配置され、前
記内部蓋体周縁を内側に折り曲げて形成した環状部によ
り挟持された補強板と、前記内部蓋体の環状部上に配置
されたＰＴＣ素子と、このＰＴＣ素子上に周縁部を当接
して配置された外部蓋体と、前記内部蓋体、前記補強
板、前記ＰＴＣ素子および前記外部蓋体にそれぞれ開口
されたガス抜き孔とから構成され、 前記内部蓋体の前記環状部の開口は、前記ＰＴＣ素子の
前記ガス抜き孔と一致するか、または前記ガス抜き孔よ
り内側に位置することを特徴とする非水電解液電池。1. An outer can, an electrode body housed in the outer can, in which a positive electrode, a separator, and a negative electrode are spirally wound, a non-aqueous electrolyte housed in the outer can, and the outer can An explosion-proof function and a sealing lid group which also serves as a terminal are hermetically fixed by an insulating gasket at the upper end opening, and the sealing lid group is provided with an internal lid body opposed to the electrode body. A reinforcing plate disposed on the inner lid via a valve membrane that is broken only by the pressure of the decomposition gas generated in the outer can, and sandwiched by an annular portion formed by bending the inner lid peripheral edge inward, A PTC element arranged on the annular portion of the inner lid, an outer lid arranged on the PTC element with a peripheral portion in contact with the PTC element, the inner lid, the reinforcing plate, the PTC element, and the outer Gas vents opened on each lid Wherein the opening of the annular portion of the inner lid is coincident with the gas vent hole of the PTC element or located inside the gas vent hole. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33770292A JP3233469B2 (en) | 1992-12-18 | 1992-12-18 | Non-aqueous electrolyte battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33770292A JP3233469B2 (en) | 1992-12-18 | 1992-12-18 | Non-aqueous electrolyte battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06187970A JPH06187970A (en) | 1994-07-08 |
| JP3233469B2 true JP3233469B2 (en) | 2001-11-26 |
Family
ID=18311161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33770292A Expired - Lifetime JP3233469B2 (en) | 1992-12-18 | 1992-12-18 | Non-aqueous electrolyte battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3233469B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7983610B2 (en) | 2006-03-02 | 2011-07-19 | Ricoh Company, Ltd. | Image formation method and an image formation apparatus |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4736149B2 (en) * | 1999-10-08 | 2011-07-27 | パナソニック株式会社 | Cylindrical secondary battery |
| JP4243148B2 (en) * | 2003-07-31 | 2009-03-25 | 三洋電機株式会社 | Sealed storage battery |
-
1992
- 1992-12-18 JP JP33770292A patent/JP3233469B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7983610B2 (en) | 2006-03-02 | 2011-07-19 | Ricoh Company, Ltd. | Image formation method and an image formation apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06187970A (en) | 1994-07-08 |
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