JP3233455B2 - Lithium ion secondary battery - Google Patents
Lithium ion secondary batteryInfo
- Publication number
- JP3233455B2 JP3233455B2 JP17845392A JP17845392A JP3233455B2 JP 3233455 B2 JP3233455 B2 JP 3233455B2 JP 17845392 A JP17845392 A JP 17845392A JP 17845392 A JP17845392 A JP 17845392A JP 3233455 B2 JP3233455 B2 JP 3233455B2
- Authority
- JP
- Japan
- Prior art keywords
- ptc element
- secondary battery
- lithium ion
- battery
- ion secondary
- 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
Landscapes
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は過電流・過熱保護素子を
内蔵したリチウムイオン二次電池に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium ion secondary battery having a built-in overcurrent / overheat protection element.
【０００２】[0002]
【従来の技術】近年、携帯電話や携帯形ノートパソコン
等の電子機器のコードレス化、高性能、化、小型軽量化
にはめざましいものがあり、これら電子機器の電源とな
る二次電池の高容量化、高エネルギー密度化への要求が
高まってきている。二次電池としては、鉛二次電池やニ
ッケルカドミウム二次電池が従来から用いられている
が、最近ではさらに高エネルギー密度化をはかれる、リ
チウムイオン二次電池のような非水電解質二次電池の開
発が進んでいる。2. Description of the Related Art In recent years, there has been remarkable progress in cordless, high-performance, compact, and lightweight electronic devices such as mobile phones and portable notebook personal computers. Demand for high energy density and high energy density is increasing. Conventionally, lead secondary batteries and nickel cadmium secondary batteries have been used as secondary batteries, but recently, non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries, which are intended to have even higher energy densities, have been used. Development is in progress.
【０００３】しかしこれら密閉形の二次電池では、例え
ば短絡等の原因で電池内圧が上昇し、比較的急速に電池
そのものが破損し電池の機能を失ったり、周辺の機器を
破損することがあった。[0003] However, in these sealed secondary batteries, the internal pressure of the battery rises due to, for example, a short circuit, and the battery itself may be damaged relatively quickly, losing the function of the battery or damaging peripheral devices. Was.
【０００４】例えば前記リチウムイオン二次電池では、
機器の故障あるいは誤使用等によって過充電状態や短絡
状態になると、電池内部に過電流が流れ、温度上昇が生
じる。さらに前記過充電状態や前記短絡状態が続くと、
電池内部でガスが発生し、内圧が上昇する場合がある。
このため前記二次電池に防爆機構を設けたり、正の温度
特性を持つＰＴＣ素子を安全装置として取り付ける方法
が提案されている。For example, in the lithium ion secondary battery,
When an overcharged state or a short-circuited state occurs due to a failure or misuse of a device, an overcurrent flows inside the battery, and a temperature rise occurs. Further, if the overcharge state and the short-circuit state continue,
Gas may be generated inside the battery and the internal pressure may increase.
For this reason, a method has been proposed in which an explosion-proof mechanism is provided in the secondary battery or a PTC element having a positive temperature characteristic is attached as a safety device.
【０００５】ところで、円筒形リチウム一次電池におい
ては、前記ＰＴＣ素子を封口体の内側に配置して外装缶
に前記封口体と共に組込んだ構造のものが知られてい
る。具体的には、前記封口体の裏面側に板状のＰＴＣ素
子を保持板と共に挟み、これら部材を環状の絶縁ガスケ
ットに挿入し、前記外装缶の上端開口部内側に配置し前
記外装缶の上端開口部をかしめることにより、前記封口
体を前記上端開口部に気密に取付け、同時に前記ＰＴＣ
素子を前記封口体及び保持板と共に前記ガスケットに保
持している。しかしながら、封口体をかしめ付けにより
前記外装缶の上端開口部に取付ける構造は封口性が劣る
という問題がある。[0005] Incidentally, there is known a cylindrical lithium primary battery having a structure in which the PTC element is arranged inside a sealing body and is assembled together with the sealing body in an outer can. Specifically, a plate-like PTC element is sandwiched on the back side of the sealing body together with a holding plate, and these members are inserted into an annular insulating gasket, arranged inside the upper end opening of the outer can, and placed on the upper end of the outer can. By caulking the opening, the sealing body is airtightly attached to the upper end opening, and at the same time, the PTC
The element is held by the gasket together with the sealing body and the holding plate. However, the structure in which the sealing body is attached to the opening at the upper end of the outer can by caulking has a problem that the sealing performance is inferior.
【０００６】このようなことから、前記封口体をレーザ
溶接により前記外装缶の上端開口部に取付けて封口性を
高めることが行なわれている。しかしながら、レーザ溶
接の場合には前記かしめ固定とは異なり、前記封口体の
みしか前記外装缶に取付けることができない。このた
め、前記封口体の裏面側に前記ＰＴＣ素子を取付けるに
は、前記かしめ固定に比べて複雑な取付け構造になる問
題がある。[0006] For this reason, the sealing body is mounted on the upper end opening of the outer can by laser welding to enhance the sealing performance. However, in the case of laser welding, unlike the caulking fixation, only the sealing body can be attached to the outer can. For this reason, there is a problem that mounting the PTC element on the back surface side of the sealing body requires a complicated mounting structure as compared with the caulking and fixing.
【０００７】そこで、リードタブ付きのＰＴＣ素子を用
いて、タブ部分を正極端子部分や外装缶底部に接続する
方法が提案された。しかし、前記リードタブ付きのＰＴ
Ｃ素子がかさ高いために、電池内の限られた空間内に内
蔵することが困難であり、また、前記タブ部分を正極端
子部分に接続した場合には、前記タブ部分が電池外装缶
側面に接触して短絡を生じるという問題点があった。Therefore, there has been proposed a method of connecting a tab portion to a positive electrode terminal portion or a bottom of an outer can using a PTC element having a lead tab. However, PT with lead tab
Since the C element is bulky, it is difficult to incorporate it in a limited space in the battery, and when the tab portion is connected to the positive electrode terminal portion, the tab portion is attached to the side of the battery outer can. There is a problem that a short circuit occurs upon contact.
【０００８】[0008]
【発明が解決しようとする課題】本発明は従来の問題を
解決するためになされたもので、ＰＴＣ素子の取付け構
造を簡素化することができ、かつ封口性を向上すること
が可能なリチウムイオン二次電池を提供するものであ
る。SUMMARY OF THE INVENTION The present invention has been made in order to solve the conventional problems, and it is possible to simplify the mounting structure of the PTC element and improve the sealing property. A secondary battery is provided.
【０００９】[0009]
【課題を解決するための手段】本発明に係るリチウムイ
オン二次電池は、発電要素を収納した外装缶と、前記外
装缶を封口する封口体と、前記外装缶の底部に導電性を
有する接着剤層を介して固定された板状のＰＴＣ素子
と、前記ＰＴＣ素子の底面に導電性を有する接着剤層を
介して固定された端子板と、 前記ＰＴＣ素子の外周面と
前記端子板の外周面並びに底面周縁とを被覆する保護リ
ングと、 少なくとも前記外装缶と前記保護リングの外周
面とに亘って被覆された熱収縮性の外装被覆樹脂チュー
ブまたは外装被覆樹脂ラベルとを備えることを特徴とす
る。なお、前記接着剤層は、前記ＰＴＣ素子の前記外装
缶と接触する面、または前記外装缶底部外面、あるいは
その両方の面に塗布される。According to the present invention, there is provided a lithium ion display device comprising:
The on-secondary battery has an outer can containing a power generation element, a sealing body for sealing the outer can, and a plate-shaped PTC element fixed to the bottom of the outer can via a conductive adhesive layer. A conductive adhesive layer on the bottom surface of the PTC element;
A terminal plate fixed through the outer peripheral surface of the PTC element;
A protective rib for covering the outer peripheral surface and the bottom peripheral edge of the terminal plate.
And at least the outer periphery of the outer can and the protective ring
Heat-shrinkable exterior coating resin tube coated over the entire surface
Or an outer covering resin label . The adhesive layer is applied to a surface of the PTC element that comes into contact with the outer can, an outer surface of the outer can bottom, or both surfaces.
【００１０】[0010]
【００１１】[0011]
【作用】本発明によれば、封口体が取付けられた外装缶
底部に板状のＰＴＣ素子を配置し、前記外装缶底部外面
と前記ＰＴＣ素子とを導電性を有する接着剤層で接着す
ることによって、極めて簡単な構造で前記ＰＴＣ素子を
前記外装缶底部に良好な導通状態を維持しつつ固定する
ことができる。その結果、過充電時及び短絡時に異常電
流が流れて電池内の温度が上昇した場合、その熱を前記
外装缶底部に密着して配置された前記ＰＴＣ素子に迅速
に伝達することができる。また、前記異常電流は前記Ｐ
ＴＣ素子にも流れる。したがって、前記ＰＴＣ素子の正
特性により所定の温度を越えて加熱されると、抵抗が急
激に高くなって異常電流を微小に制限でき電池の過度の
発熱を抑制できる。According to the present invention, a plate-shaped PTC element is arranged on the bottom of an outer can to which a sealing member is attached, and the outer surface of the outer can bottom and the PTC element are bonded to each other with an adhesive layer having conductivity. Thereby, the PTC element can be fixed to the bottom of the outer can with a very simple structure while maintaining a good conduction state. As a result, when an abnormal current flows at the time of overcharging and a short circuit and the temperature inside the battery rises, the heat can be quickly transmitted to the PTC element arranged in close contact with the bottom of the outer can. Further, the abnormal current is determined by the P
It also flows to the TC element. Therefore, when the temperature exceeds a predetermined temperature due to the positive characteristics of the PTC element, the resistance sharply increases, the abnormal current can be minutely limited, and excessive heat generation of the battery can be suppressed.
【００１２】また、ＰＴＣ素子を外装缶底部に取付ける
ことによって、従来のようにＰＴＣ素子を封口体に取付
けた場合に起こる取付け構造の複雑化を解消できると共
に前記封口体をレーザ溶接により前記外装缶の上端開口
部に取付けることができ、封口性を著しく向上すること
ができる。Also, by mounting the PTC element on the bottom of the outer can, it is possible to eliminate the complexity of the mounting structure that would otherwise occur when the PTC element was mounted on the sealing body as in the prior art, and to attach the sealing body to the outer can by laser welding. Can be attached to the upper end opening, and the sealing performance can be significantly improved.
【００１３】さらに、前記二次電池を組電池として用い
た場合、素電池自体にＰＴＣ素子が組込まれているた
め、組電池内の素電池間を繋ぐリード線に別途ＰＴＣ素
子を取付けるという煩雑な作業を解消できる。Further, when the secondary battery is used as an assembled battery, since the PTC element is incorporated in the unit cell itself, a complicated PTC element is separately attached to a lead wire connecting the cells in the assembled battery. Work can be eliminated.
【００１４】さらに、熱収縮性を有する外装被覆樹脂チ
ューブ又は外装被覆樹脂ラベルを前記封口体の外周縁付
近、前記外装缶及び前記ＰＴＣ素子の外周縁付近に亘っ
て被覆し、加熱収縮することによって、前記外装缶底部
に前記ＰＴＣ素子をより確実に固定することができる。Further, a heat-shrinkable outer covering resin tube or outer covering resin label is coated over the vicinity of the outer periphery of the sealing body and the outer periphery of the outer can and the PTC element, and is shrunk by heating. The PTC element can be more securely fixed to the bottom of the outer can.
【００１５】さらに、前記ＰＴＣ素子の外周縁と前記外
装被覆樹脂チューブ又は外装被覆樹脂ラベルとの間に保
護リングを介装することによって、前記ＰＴＣ素子を電
池外部からの衝撃より保護することができ、より高い安
全性を確保することができる。Further, by interposing a protective ring between the outer peripheral edge of the PTC element and the outer coating resin tube or the outer coating resin label, the PTC element can be protected from an impact from outside the battery. , Higher safety can be ensured.
【００１６】[0016]
【実施例】本発明を円筒形リチウムイオン二次電池に適
用した例について図１を参照して説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a cylindrical lithium ion secondary battery will be described with reference to FIG.
【００１７】図１は、本実施例の円筒形リチウムイオン
二次電池を示す半裁図である。例えばステンレスからな
る有底円筒形の外装缶１は負極端子を兼ねる。積層電極
体２は、前記外装缶１内に収納されている。前記積層電
極体２は、負極３と正極４とセパレータ５とを渦巻状に
捲回して形成されている。前記負極３は活物質として例
えば炭素質物質を含み、前記正極４は活物質として例え
ばＬｉＣｏＯ2 を含み、前記セパレータ５は例えば電解
液を含浸したポリプロピレン製の多孔性シートから形成
されている。絶縁板６は、前記外装缶１の底部内面と前
記積層電極体２との間に介装され、前記外装缶１と前記
積層電極体２とを互いに電気的に絶縁している。FIG. 1 is a half cut view showing a cylindrical lithium ion secondary battery of this embodiment. For example, a bottomed cylindrical outer can 1 made of stainless steel also serves as a negative electrode terminal. The laminated electrode body 2 is housed in the outer can 1. The laminated electrode body 2 is formed by spirally winding a negative electrode 3, a positive electrode 4, and a separator 5. The negative electrode 3 includes, for example, a carbonaceous material as an active material, the positive electrode 4 includes, for example, LiCoO 2 as an active material, and the separator 5 is formed of, for example, a porous sheet made of polypropylene impregnated with an electrolyte. The insulating plate 6 is interposed between the inner surface of the bottom of the outer can 1 and the laminated electrode body 2 to electrically insulate the outer can 1 and the laminated electrode body 2 from each other.
【００１８】中央付近に穴を有する例えばステンレスか
らなる封口体７は、前記外装缶１の開口部にレーザシー
ム溶接によって気密に取付けられている。例えばステン
レスからなる正極ピン端子８は、その両端が前記封口体
７の上下面から突出するように前記封口体７の穴にガラ
ス製絶縁材９を介してハーメチックシールによって取付
けられている。例えばポリプロピレン樹脂からなる環状
のスペーサー１０は、前記外装缶１内の前記積層電極体
２上部と前記封口体７の下面の間に介装されている。正
極リード１１は、その一端が前記積層電極体２の正極４
に接続され、かつその他端が前記正極ピン端子８の下端
に接続されている。負極リード１２は、その一端が前記
積層電極体２の負極３に接続され、かつその他端が前記
外装缶１の底部内面に接続されている。A sealing body 7 made of, for example, stainless steel having a hole near the center is hermetically attached to the opening of the outer can 1 by laser seam welding. For example, the positive electrode pin terminal 8 made of stainless steel is attached to the hole of the sealing body 7 via a glass insulating material 9 by a hermetic seal so that both ends protrude from the upper and lower surfaces of the sealing body 7. For example, an annular spacer 10 made of polypropylene resin is interposed between the upper portion of the laminated electrode body 2 in the outer can 1 and the lower surface of the sealing body 7. One end of the positive electrode lead 11 is connected to the positive electrode 4 of the laminated electrode body 2.
And the other end is connected to the lower end of the positive electrode pin terminal 8. The negative electrode lead 12 has one end connected to the negative electrode 3 of the laminated electrode body 2 and the other end connected to the inner surface of the bottom of the outer can 1.
【００１９】円板状のＰＴＣ素子１３は、前記外装缶１
底部外面に導電性の接着剤層１４ａによって接着され
る。例えばステンレスからなる端子板１５は、前記ＰＴ
Ｃ素子１３の底面に導電性の接着剤層１４ｂによって接
着されている。前記接着剤層１４ａと前記接着剤層１４
ｂは、例えばエポキシ系の樹脂に銀の微細粉末を混合し
たペーストを前記ＰＴＣ素子１３の両面に塗布すること
により形成される。例えばポリプロピレンからなる保護
リング１６は、前記ＰＴＣ素子１３及び前記端子板１５
の外周縁と側面、前記端子板１５の底面周縁を囲むよう
に配置され、前記ＰＴＣ素子１３と前記端子板１５とを
外部からの衝撃より保護している。熱収縮性を有する外
装被覆樹脂チューブ１７は、前記封口体７の上部周縁、
前記外装缶１及び前記保護リング１６の外周面と底面周
縁付近に亘って被覆され、加熱収縮されることによって
前記外装缶１底部に前記ＰＴＣ素子１３及び前記端子板
１５を前記保護リング１６を介して取付けて、保持安定
性を向上させている。The disc-shaped PTC element 13 is provided in the outer can 1.
The bottom outer surface is bonded by a conductive adhesive layer 14a. For example, the terminal plate 15 made of stainless steel is made of the PT
It is bonded to the bottom surface of the C element 13 by a conductive adhesive layer 14b. The adhesive layer 14a and the adhesive layer 14
b is formed, for example, by applying a paste in which fine silver powder is mixed with an epoxy resin to both surfaces of the PTC element 13. The protection ring 16 made of, for example, polypropylene is used for the PTC element 13 and the terminal plate 15.
The PTC element 13 and the terminal plate 15 are protected from external impact by being arranged so as to surround the outer peripheral edge and side surface of the terminal plate 15 and the peripheral edge of the bottom surface of the terminal plate 15. The outer covering resin tube 17 having heat shrinkability is provided on the upper periphery of the sealing body 7,
The PTC element 13 and the terminal plate 15 are coated on the bottom of the outer can 1 via the protective ring 16 by being coated over the outer peripheral surface and the vicinity of the bottom peripheral edge of the outer can 1 and the protective ring 16 and being heated and shrunk. To improve holding stability.
【００２０】このような構成によれば、封口体７が取付
けられた外装缶１底部に円板状のＰＴＣ素子１３を、導
電性を有する接着剤層１４ａにより固定することによっ
て、前記ＰＴＣ素子１３を前記外装缶１底部に良好な導
通状態を維持しつつ固定することができる。その結果、
極めて簡単な構造で前記ＰＴＣ素子１３をリチウムイオ
ン二次電池に組込むことができる。According to such a configuration, the disc-shaped PTC element 13 is fixed to the bottom of the outer can 1 to which the sealing member 7 is attached by the conductive adhesive layer 14a, whereby the PTC element 13 is fixed. Can be fixed to the bottom of the outer can 1 while maintaining a good conduction state. as a result,
The PTC element 13 can be incorporated in a lithium ion secondary battery with a very simple structure.
【００２１】また、前記ＰＴＣ素子１３を組込んだ前記
二次電池において、過充電や誤使用による短絡に起因し
て異常電流が流れて電池内の温度が上昇すると、その熱
は前記外装缶１底部に接着剤層１４ａを介して密着して
取付けられたＰＴＣ素子１３に迅速に伝達される。ま
た、前記異常電流は前記負極端子側に接続された前記Ｐ
ＴＣ素子１３自体にも流れる。前記ＰＴＣ素子１３とし
て例えば図２に示す正の温度特性を有するものを用いた
場合、前記外装缶１からの熱伝達及びそれ自体の状態に
より８０℃を越える温度まで上昇されると、抵抗値が
０．１Ω程度から急激に上昇し、１２０℃前後の温度に
なると１０4 Ω程度まで高くなる。その結果、前記異常
電流は前記ＰＴＣ素子１３によって微小に制限され、電
池が過度に発熱して爆発する等の事故を未然に防止する
ことができる。In the secondary battery incorporating the PTC element 13, when an abnormal current flows due to a short circuit due to overcharging or misuse and the temperature inside the battery rises, the heat is transferred to the outer can 1 It is quickly transmitted to the PTC element 13 which is closely attached to the bottom via the adhesive layer 14a. Further, the abnormal current is generated by the P connected to the negative terminal side.
It also flows to the TC element 13 itself. For example, when the PTC element 13 having a positive temperature characteristic shown in FIG. 2 is used, when the temperature is raised to a temperature exceeding 80 ° C. due to the heat transfer from the outer can 1 and the state of itself, the resistance value increases. It rises sharply from about 0.1Ω and reaches 10 4 at a temperature around 120 ° C. It increases to about Ω. As a result, the abnormal current is minutely limited by the PTC element 13, and it is possible to prevent an accident such as explosion due to excessive heat generation of the battery.
【００２２】さらに、前記ＰＴＣ素子１３を前記外装缶
１の底部に配置することによって、従来のようにＰＴＣ
素子を封口体に取付けることに伴なう封口手段の制約を
回避でき、前記封口体７を前記外装缶１の開口部にレー
ザシーム溶接により取付けることができる。その結果、
封口性の良好なリチウムイオン二次電池を得ることがで
きる。Further, by arranging the PTC element 13 at the bottom of the outer can 1, the conventional PTC element 13 is provided.
It is possible to avoid the restriction of the sealing means accompanying mounting the element to the sealing body, and it is possible to mount the sealing body 7 to the opening of the outer can 1 by laser seam welding. as a result,
A lithium ion secondary battery with good sealing properties can be obtained.
【００２３】さらに、前記外装被覆樹脂チューブ１７
を、前記封口体７の上部周縁、前記外装缶１及び前記保
護リング１６の外周面と底面周縁付近を亘って覆い、熱
収縮することによって、前記ＰＴＣ素子１３と前記端子
板１５とを前記外装缶１底部により確実に固定すること
が可能である。Further, the outer sheath resin tube 17
Is covered over the upper peripheral edge of the sealing body 7, the outer peripheral surface of the outer can 1 and the protective ring 16, and the vicinity of the bottom peripheral edge, and is thermally contracted, so that the PTC element 13 and the terminal plate 15 are covered with the outer peripheral surface. It is possible to securely fix to the bottom of the can 1.
【００２４】さらに、前記ＰＴＣ素子１３と前記外装被
覆樹脂チューブ１７との間に保護リング１６を介装する
ことによって、電池の使用時における落下等による衝撃
を前記保護リング１６で吸収、緩和できるため、前記Ｐ
ＴＣ素子１３が破損されるのを防止できる。Further, by interposing a protective ring 16 between the PTC element 13 and the outer sheath resin tube 17, an impact due to a drop or the like during use of the battery can be absorbed and mitigated by the protective ring 16. , Said P
It is possible to prevent the TC element 13 from being damaged.
【００２５】なお、前記実施例では導電性を有する接着
剤層としてエポキシ系の樹脂に銀の微細粉末を混合した
ペーストを用いたが、例えばエポキシ系の樹脂に炭素質
物質や半田等の微細粉末を混合したペーストや、導電性
接着剤、導電性接着シート等も使用することが可能であ
る。In the above-described embodiment, a paste in which fine silver powder is mixed with an epoxy resin is used as the conductive adhesive layer. For example, a fine powder of a carbonaceous substance or solder is mixed with an epoxy resin. , A conductive adhesive, a conductive adhesive sheet, or the like can also be used.
【００２６】前記実施例では、ＰＴＣ素子の底面側にそ
の保護を目的として端子板を配置したが、例えばＰＴＣ
素子の構成部品である電極板を厚くすれば前記端子板を
省略することが可能である。In the above embodiment, the terminal plate is arranged on the bottom side of the PTC element for the purpose of protection.
If the electrode plate which is a component of the element is made thicker, the terminal plate can be omitted.
【００２７】前記実施例では、外装被覆樹脂チューブを
用いて外装缶の底部外面に配置したＰＴＣ素子を保持す
る構成にしたが、前記チューブの代りに片面に接着剤が
付着された外装被覆樹脂ラベルを用い、このラベルを前
記外装缶外周にその上下端が突出するように捲回し、熱
収縮させることによって実施例と同様な効果を達成する
ことができる。前記実施例では、円筒形リチウムイオン
二次電池に適用して説明したが、角形リチウムイオン二
次電池にも同様に適用することができる。In the above embodiment, the PTC element disposed on the outer surface of the bottom of the outer can is held by using the outer coating resin tube. However, the outer coating resin label having an adhesive adhered to one surface instead of the tube is used. This label is wound around the outer periphery of the outer can so that the upper and lower ends thereof protrude, and is thermally contracted, whereby the same effect as that of the embodiment can be achieved. In the above-described embodiment, the description has been made by applying the present invention to a cylindrical lithium ion secondary battery. However, the present invention can be similarly applied to a prismatic lithium ion secondary battery.
【００２８】[0028]
【発明の効果】以上詳述したように、本発明によればＰ
ＴＣ素子の取付け構造を簡素化することができ、かつ封
口性を向上することが可能で、安全性が高く、単電池の
みならず組電池としても有用なリチウムイオン二次電池
を提供できる。As described in detail above, according to the present invention, P
It is possible to provide a lithium ion secondary battery which can simplify the mounting structure of the TC element, improve the sealing property, is highly safe, and is useful not only as a unit cell but also as an assembled battery.
【図１】本実施例である円筒形リチウムイオン二次電池
の半裁図。FIG. 1 is a half cut view of a cylindrical lithium ion secondary battery according to the present embodiment.
【図２】本実施例である円筒形リチウムイオン二次電池
におけるＰＴＣ素子の温度変化に対する抵抗値の変化を
示す特性図。FIG. 2 is a characteristic diagram showing a change in resistance value of the PTC element with respect to a temperature change in the cylindrical lithium ion secondary battery according to the embodiment.
１…電池外装缶、２…積層電極体、７…封口体、１３…
ＰＴＣ素子、１４ａ，１４ｂ…導電性接着剤層、１６…
保護リング、１７…外装被覆樹脂チューブ。DESCRIPTION OF SYMBOLS 1 ... Battery outer can, 2 ... Laminated electrode body, 7 ... Sealing body, 13 ...
PTC element, 14a, 14b ... conductive adhesive layer, 16 ...
Protective ring, 17 ... exterior coating resin tube.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 川辺 正道 神奈川県川崎市幸区堀川町72番地 株式 会社東芝堀川町工場内 (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 (72)発明者 笠原 茂雄 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 高山 元 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 (56)参考文献 実開 昭59−161266（ＪＰ，Ｕ) 実開 昭59−164166（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 2/34 H01M 10/40 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masamichi Kawabe 72 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Horikawa-cho Plant (72) Inventor Katsuhiko Inoue 1-3-1 Yakko, Kawasaki-ku, Kawasaki-shi, Kanagawa No. Asahi Kasei Kogyo Co., Ltd. (72) Inventor Shigeo Kasahara 3-4-10 Minamishinagawa, Shinagawa-ku, Tokyo Toshiba Battery Co., Ltd. (72) Gen Takayama 3-4-1-10 Minamishinagawa, Shinagawa-ku, Tokyo In Toshiba Battery Co., Ltd. (56) References: JP-A-59-161266 (JP, U) JP-A-59-164166 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) H01M 2/34 H01M 10/40
Claims (1)
定された板状のＰＴＣ素子と、前記ＰＴＣ素子の底面に導電性を有する接着剤層を介し
て固定された端子板と、 前記ＰＴＣ素子の外周面と前記端子板の外周面並びに底
面周縁とを被覆する保護リングと、 少なくとも前記外装缶と前記保護リングの外周面とに亘
って被覆された熱収縮性の外装被覆樹脂チューブまたは
外装被覆樹脂ラベルと を備えることを特徴とするリチウ
ムイオン二次電池。An outer can housing a power generating element, a sealing body for sealing the outer can, a plate-shaped PTC element fixed to a bottom of the outer can via a conductive adhesive layer, Via a conductive adhesive layer on the bottom surface of the PTC element
Terminal plate fixedly attached, the outer peripheral surface of the PTC element, the outer peripheral surface and the bottom of the terminal plate.
A protective ring that covers the surface periphery, and at least the outer peripheral surface of the outer can and the protective ring.
Heat-shrinkable outer coating resin tube coated with
A lithium ion secondary battery comprising an outer covering resin label .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17845392A JP3233455B2 (en) | 1992-07-06 | 1992-07-06 | Lithium ion secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17845392A JP3233455B2 (en) | 1992-07-06 | 1992-07-06 | Lithium ion secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0620677A JPH0620677A (en) | 1994-01-28 |
| JP3233455B2 true JP3233455B2 (en) | 2001-11-26 |
Family
ID=16048786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17845392A Expired - Lifetime JP3233455B2 (en) | 1992-07-06 | 1992-07-06 | Lithium ion secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3233455B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6469197B1 (en) | 1998-04-06 | 2002-10-22 | Nec Corporation | Negative photoresist composition using polymer having 1,2-diol structure and process for forming pattern using the same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100449762B1 (en) * | 2002-09-05 | 2004-09-22 | 삼성에스디아이 주식회사 | Lithium secondary battery |
| JP4472259B2 (en) * | 2002-12-27 | 2010-06-02 | パナソニック株式会社 | Electrochemical element |
| WO2004062022A1 (en) * | 2002-12-27 | 2004-07-22 | Matsushita Electric Industrial Co., Ltd. | Electrochemical device and method for manufacturing same |
-
1992
- 1992-07-06 JP JP17845392A patent/JP3233455B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6469197B1 (en) | 1998-04-06 | 2002-10-22 | Nec Corporation | Negative photoresist composition using polymer having 1,2-diol structure and process for forming pattern using the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0620677A (en) | 1994-01-28 |
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