JP3349529B2 - Lithium ion secondary battery - Google Patents
Lithium ion secondary batteryInfo
- Publication number
- JP3349529B2 JP3349529B2 JP29580992A JP29580992A JP3349529B2 JP 3349529 B2 JP3349529 B2 JP 3349529B2 JP 29580992 A JP29580992 A JP 29580992A JP 29580992 A JP29580992 A JP 29580992A JP 3349529 B2 JP3349529 B2 JP 3349529B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode body
- secondary battery
- lithium ion
- conductive cover
- 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 - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
Landscapes
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、リチウムイオン二次電
池に関し、特に発電要素である電極体の電池外装缶内部
への挿入性を改善したリチウムイオン二次電池に係わ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium ion secondary battery, and more particularly to a lithium ion secondary battery in which an electrode as a power generating element has improved insertability into a battery outer can.
【0002】[0002]
【従来の技術】近年、携帯電話や携帯型ノートパソコン
等の電子機器のコードレス化、高性能化、小型軽量化
は、目覚ましいものがある。このため、前記電子機器の
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、従来か
ら鉛二次電池やニッケルカドミウム二次電池が用いられ
ているが、最近ではさらに高エネルギー密度化が達成す
ることが可能な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。また、電池の高容量
化に伴って電極体も可能な限り大きくする傾向にある。2. Description of the Related Art In recent years, there has been remarkable progress in cordless, high-performance, and compact and lightweight electronic devices such as mobile phones and portable notebook personal computers. For this reason, demands for higher capacity and higher energy density of a secondary battery serving as a power supply of the electronic device are increasing. Conventionally, lead secondary batteries and nickel cadmium secondary batteries have been used as secondary batteries, but recently, non-aqueous electrolytes such as lithium ion secondary batteries, which can achieve even higher energy densities, have been used. The development of secondary batteries is in progress. Further, as the capacity of the battery increases, the size of the electrode body tends to be as large as possible.
【0003】しかしながら、前記リチウムイオン二次電
池の組み立て時において、高容量化を計るための可能な
限り大きな電極体を外装缶内に挿入すると、前記電極体
と前記外装缶の間には寸法的に隙間がほとんどないため
に、前記外装缶の開口部と電極体の外周部が干渉して挿
入が困難になったり、或いは前記電極体の外周面が損傷
される恐れがあった。特に、前記電極体が損傷されると
内部短絡を起こすという問題が生じる。However, when assembling the lithium ion secondary battery, if an electrode body as large as possible for increasing the capacity is inserted into the outer can, the dimension between the electrode body and the outer can becomes large. Since there is almost no gap, the opening of the outer can and the outer peripheral portion of the electrode body may interfere with each other, making insertion difficult, or the outer peripheral surface of the electrode body may be damaged. In particular, if the electrode body is damaged, an internal short circuit occurs.
【0004】[0004]
【発明が解決しようとする課題】本発明は、電極体の外
装缶への挿入性を改善したリチウムイオン二次電池を提
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 lithium ion secondary battery in which the electrode body can be easily inserted into an outer can.
【0005】[0005]
【発明が解決しようとする課題】本発明は、外装缶と、
前記外装缶内に挿入される発電要素である電極体とを備
えたリチウムイオン二次電池において、SUMMARY OF THE INVENTION The present invention provides an outer can,
In a lithium ion secondary battery including an electrode body that is a power generation element inserted into the outer can,
【0006】前記電極体は、底部を含む外周側面が導電
性カバーで包み込まれて前記外装缶内に挿入され、かつ
前記導電性カバーは底部と前記底部を支点にして傾動す
る対向した一対の側壁とを有する形状をなすことを特徴
としたリチウムイオン二次電池である。[0006] The electrode body has an outer peripheral side surface including a bottom wrapped with a conductive cover and inserted into the outer can, and the conductive cover is a pair of opposed side walls that tilt about the bottom and the bottom as a fulcrum. a lithium ion secondary battery, characterized in that a shape that having a and.
【0007】前記導電性カバーの前記側面は、前記電極
体を前記外装缶内に挿入する際に前記電極体の側面に当
接して前記電極体を保護することから、前記側面の高さ
は前記電極体の高さと等しくすることが望ましい。The side surface of the conductive cover abuts on the side surface of the electrode body when the electrode body is inserted into the outer can to protect the electrode body. It is desirable to make it equal to the height of the electrode body.
【0008】前記導電性カバーにおける前記対向する一
対の側壁は、両側側辺が内側に屈曲した形状を有するこ
とが望ましい。このような導電性カバーは、前記電極体
の対向する側面を前記対向する一対の側壁で覆うことが
できると共に、前記電極体の他の対向する幅の狭い側面
をも前記一対の側壁における両側側辺の屈曲部で覆うこ
とができる。It is preferable that the pair of opposed side walls of the conductive cover have a shape in which both side sides are bent inward. Such a conductive cover can cover the opposing side surfaces of the electrode body with the pair of opposing side walls, and also cover other opposing narrow side surfaces of the electrode body on both sides of the pair of side walls. It can be covered by the bent part of the side.
【0009】前記電極体の底面と前記導電性カバーの底
部との間には、絶縁板を配置したり、前記カバーの底部
上面に絶縁層を被覆することが望ましい。このような絶
縁板の介在や絶縁層の被覆により前記電極体の正極およ
び負極が前記導電性カバーの底部に接触して内部短絡を
生じるのを確実に防止することが可能になる。It is desirable that an insulating plate be disposed between the bottom surface of the electrode body and the bottom of the conductive cover, or that the top surface of the bottom of the cover be covered with an insulating layer. With the interposition of the insulating plate and the coating of the insulating layer, it is possible to reliably prevent the positive electrode and the negative electrode of the electrode body from coming into contact with the bottom of the conductive cover to cause an internal short circuit.
【0010】本発明に係わるリチウムイオン二次電池
は、前記外装缶の上部開口部に取り付けられた封口体に
安全弁機構をさらに取り付けることを許容する。前記安
全弁機構は、前記封口体に開口された放圧用の孔と、前
記封口体外面に取り付けられ、前記孔に少なくとも対応
する個所に設けられた溝によりその底部に弁膜が形成さ
れた薄膜とから構成される。本発明に係わるリチウムイ
オン二次電池は、前記外装缶の底面に導電性接着剤層を
介して固定された板状のPTC素子をさらに備えること
を許容する。[0010] The lithium ion secondary battery according to the present invention allows a safety valve mechanism to be further attached to a sealing body attached to an upper opening of the outer can. The safety valve mechanism comprises a pressure-release hole opened in the sealing body, and a thin film in which a valve membrane is formed at the bottom by a groove attached to the outer surface of the sealing body and provided at least at a location corresponding to the hole. Be composed. The lithium ion secondary battery according to the present invention may further include a plate-shaped PTC element fixed to a bottom surface of the outer can via a conductive adhesive layer.
【0011】[0011]
【作用】本発明によれば、底部とこの底部を支点にして
傾動する対向した一対の側壁とを有する形状をなす導電
性カバーにて電極体電極体の底部を含む外周側面を包み
込んだ状態で外装缶内に挿入することによって、挿入作
業時に前記導電性カバーが挿入ガイドの役目を果たす。
このため、前記電極体の挿入作業を簡素化することがで
きる。また、前記挿入時の前記外装缶と前記電極体の干
渉による前記電極体の底部及び外周部の損傷を防止でき
るため、前記損傷に伴う内部短絡を防止することができ
る。According to the present invention, with the bottom and this bottom serving as a fulcrum,
Conducting shape having a pair of opposed side walls that tilt
By inserting the outer peripheral side surface including the bottom of the electrode body with the conductive cover into the outer can, the conductive cover serves as an insertion guide during the insertion operation.
For this reason, the work of inserting the electrode body can be simplified. In addition, since the bottom and the outer periphery of the electrode body can be prevented from being damaged due to interference between the outer can and the electrode body at the time of insertion, an internal short circuit due to the damage can be prevented.
【0012】また、前記外装缶の上部開口部に封口体を
取り付け、前記封口体に安全弁機構を設ければ、短絡等
の原因によりガスが発生して電池内圧が上昇した場合、
前記安全弁機構が動作してガスを外装缶の外部に逃散で
きるため、前記電池内圧の過度の上昇に伴う外装缶の破
裂や変形を防止できる。Further, if a sealing member is attached to the upper opening of the outer can and a safety valve mechanism is provided in the sealing member, when gas is generated due to a short circuit or the like and the internal pressure of the battery rises,
Since the safety valve mechanism operates to allow gas to escape to the outside of the outer can, it is possible to prevent the outer can from being ruptured or deformed due to an excessive increase in the battery internal pressure.
【0013】すなわち、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、外装缶内部でガス発生が起こる場合があ
り、電池内圧が上昇する。電池内圧の上昇は、外装缶の
破損を招く恐れがあり、それによって外装缶内の電解液
が外部に漏洩して周辺の機器を損傷する。このため、従
来の二次電池では外装缶の上部開口部に取り付けた封口
体に安全弁機構を設けることが行われている。しかしな
がら、外装缶内でガス発生が起こり、そのガス発生が電
極体の底に近い位置、つまり前記安全弁機構から離れた
場所である場合、前記電極体が隙間なく前記外装缶に挿
入されていると、電極体底部で発生したガスは、十分な
大きさのガスの通り道がないために、前記安全弁機構に
まで到達できない。その結果、前記ガスは前記外装缶内
の底部に溜まり、前記安全弁機構が働かずに電池の破裂
に至る恐れがあった。That is, when an overcharged state or a short-circuited state occurs in a lithium ion secondary battery due to failure or misuse of equipment, gas may be generated inside the outer can, and the internal pressure of the battery increases. An increase in battery internal pressure may cause damage to the outer can, thereby leaking the electrolyte in the outer can to the outside and damaging peripheral devices. For this reason, in a conventional secondary battery, a safety valve mechanism is provided in a sealing body attached to an upper opening of an outer can. However, when gas generation occurs in the outer can, and the gas generation is at a position near the bottom of the electrode body, that is, at a place distant from the safety valve mechanism, when the electrode body is inserted into the outer can without a gap. The gas generated at the bottom of the electrode body cannot reach the safety valve mechanism because there is no passage of gas of a sufficient size. As a result, the gas accumulates at the bottom inside the outer can, and the safety valve mechanism may not operate, possibly leading to battery rupture.
【0014】このようなことから、本発明に係わる二次
電池は前記外装缶内に前記電極体を前記導電性カバーと
共に挿入すると、前記外装缶と前記導電性カバーとの間
に前記外装缶の深さ方向にわたる空間が形成されるた
め、前述したようにガスが発生した場合でも発生ガスを
前記空間を通して前記封口体に取り付けた前記安全弁機
構へ確実に導くことができる。したがって、前記安全弁
機構を確実に動作させてガスを外装缶の外部に逃散でき
るため、前記電池内圧の過度の上昇に伴う外装缶の破裂
や変形を防止できる。Therefore, when the electrode assembly is inserted into the outer can together with the conductive cover, the secondary battery according to the present invention has the outer can between the outer can and the conductive cover. Since the space extending in the depth direction is formed, even when the gas is generated as described above, the generated gas can be reliably guided to the safety valve mechanism attached to the sealing body through the space. Therefore, the safety valve mechanism can be reliably operated to allow the gas to escape to the outside of the outer can, so that the outer can can be prevented from being ruptured or deformed due to an excessive increase in the battery internal pressure.
【0015】さらに、前記外装缶の底面に板状のPTC
素子を固定すれば、過電流時および短絡時に異常電流が
流れて電池内部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した前記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PTC
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
高くなって前記異常電流の流れを微小に制限できるた
め、電池の過度の発熱を抑制することができる。Further, a plate-like PTC is provided on the bottom of the outer can.
If the element is fixed, when an abnormal current flows at the time of overcurrent or 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 PTC
It also flows to the element. Therefore, when the temperature exceeds a predetermined temperature due to the positive characteristics of the PTC element, the resistance sharply increases and the flow of the abnormal current can be minutely limited, so that excessive heat generation of the battery can be suppressed. .
【0016】[0016]
【実施例】以下、本発明を角形リチウムイオン二次電池
に適用した例を図1〜図4を参照して詳細に説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a prismatic lithium ion secondary battery will be described in detail with reference to FIGS.
【0017】図1は、本発明に係わる角形リチウムイオ
ン二次電池の正面断面図、図2は図1の二次電池の上面
図、図3は図1のIII-III 線に沿う断面図、図4は図1
の分解斜視図である。FIG. 1 is a front sectional view of a prismatic lithium ion secondary battery according to the present invention, FIG. 2 is a top view of the secondary battery of FIG. 1, FIG. 3 is a sectional view taken along line III-III of FIG. FIG. 4 shows FIG.
FIG. 3 is an exploded perspective view of FIG.
【0018】例えばステンレスからなる有底矩形筒状体
をなす外装缶1は、負極端子を兼ね、発電要素である電
極体2が導電性カバー3で包み込まれた状態で挿入され
ている。前記電極体2は、図4に示すように例えば炭素
質物を活物質とする負極と、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なるセパレータと、LiC
oO2 を活物質とする正極とを前記負極が最外周に位置
するように渦巻状に捲回した後、偏平状にプレス成形す
ることにより作製したものである。前記導電性カバー3
は、例えば銅板を板金成形したもので、図4に示すよう
に底部4と前記底部4を支点にして傾動する対向した一
対の側壁5と、前記一対の側壁5の両側側辺を内側に向
けて屈曲した屈曲部6とから構成されている。つまり、
前記電極体2は、その底面および対向する面積の大きい
側面が前記導電性カバー3の底部4および一対の側壁5
で覆われ、さらに前記電極体2における他の対向する面
積の小さい対向する側面は前記導電性カバー3の屈曲部
6により覆われている。このような前記導電性カバー3
で包み込まれた前記電極体2を前記外装缶1に挿入する
と図3に示すように前記外装缶1内のコーナ部と前記導
電性カバー3との間にそれぞれガス案内空間7が形成さ
れる。絶縁板8は、前記電極体2底面と前記導電性カバ
ー3の底部6との間に介装され、前記電極体2底面に位
置する正極および負極が前記導電性カバー3の底部に接
触して短絡するのを防止している。正極リード9は、前
記電極体2の上面に露出した正極(図示せず)に接続さ
れている。For example, an outer can 1 having a bottomed rectangular cylindrical body made of stainless steel also serves as a negative electrode terminal, and is inserted with an electrode body 2 as a power generating element wrapped by a conductive cover 3. As shown in FIG. 4, the electrode body 2 includes, for example, a negative electrode using a carbonaceous material as an active material, a separator made of a porous sheet made of polypropylene impregnated with an electrolytic solution,
It is manufactured by spirally winding a positive electrode using oO 2 as an active material so that the negative electrode is located at the outermost periphery, and then press-molding it into a flat shape. The conductive cover 3
Is a sheet metal formed from, for example, a copper plate. As shown in FIG. 4, a bottom 4 and a pair of opposed side walls 5 tilting with the bottom 4 as a fulcrum, and both side sides of the pair of side walls 5 face inward. And a bent portion 6 which is bent. That is,
The electrode body 2 has a bottom surface and a side surface having a large area facing the bottom surface 4 of the conductive cover 3 and a pair of side walls 5.
Further, another opposing side surface of the electrode body 2 having a small opposing area is covered by a bent portion 6 of the conductive cover 3. Such a conductive cover 3
When the electrode body 2 wrapped in is inserted into the outer can 1, gas guide spaces 7 are respectively formed between the corners in the outer can 1 and the conductive cover 3 as shown in FIG. The insulating plate 8 is interposed between the bottom surface of the electrode body 2 and the bottom 6 of the conductive cover 3, and the positive electrode and the negative electrode located on the bottom surface of the electrode body 2 come into contact with the bottom of the conductive cover 3. Prevents short circuit. The positive electrode lead 9 is connected to a positive electrode (not shown) exposed on the upper surface of the electrode body 2.
【0019】上部に鍔部10を有し、中央付近に穴11
が開口された封口体12は、前記外装缶1の上部開口部
に前記鍔部10を前記外装缶1の開口部上端に当接させ
ることにより嵌合され、前記鍔部10の下面と前記外装
缶1の開口部上端との当接部にレーザ溶接を施すことに
より前記外装缶1に気密に取り付けられている。中央に
穴13を有する絶縁材料からなるスペーサ14は、前記
電極体2と前記封口板12との間には介装されている。
このような前記スペーサ14の配置により、前記正極リ
ード9が前記スペーサ14の穴13内に挿入される。絶
縁リング15は、前記封口体12の中央下面に前記穴1
1を覆うように取り付けられている。例えばステンレス
からなる正極ピン端子16は、前記封口体12の前記穴
11内にガラス製絶縁材17を介してハーメティクシー
ルされ、かつ前記正極ピン端子16の下端は前記絶縁リ
ング15を貫通して前記スペーサ14の前記穴13内に
挿入された前記正極リード9と接続されている。なお、
ガラス製絶縁材17は前記負極端子となる前記外装缶1
と電気的に接続される前記封口体12と前記正極ピン端
子16との絶縁を図っている。A flange 10 is provided at the upper part, and a hole 11 is provided near the center.
Is fitted by bringing the flange 10 into contact with the upper opening of the outer can 1 by contacting the upper end of the opening of the outer can 1 with the lower surface of the flange 10 and the outer casing. The can 1 is hermetically attached to the outer can 1 by performing laser welding on a contact portion with the upper end of the opening. A spacer 14 made of an insulating material having a hole 13 in the center is interposed between the electrode body 2 and the sealing plate 12.
With such an arrangement of the spacer 14, the positive electrode lead 9 is inserted into the hole 13 of the spacer 14. The insulating ring 15 is provided at the center lower surface of the sealing body 12 with the hole 1.
1 so as to cover it. For example, a positive electrode pin terminal 16 made of stainless steel is hermetically sealed in the hole 11 of the sealing body 12 via a glass insulating material 17, and a lower end of the positive electrode pin terminal 16 penetrates the insulating ring 15. And is connected to the positive electrode lead 9 inserted into the hole 13 of the spacer 14. In addition,
The insulating material 17 made of glass is used for the outer can 1 serving as the negative electrode terminal.
Insulation between the sealing member 12 and the positive electrode pin terminal 16 electrically connected to each other is achieved.
【0020】例えば矩形状穴18は、前記封口体12に
前記穴11から所望距離隔てて開口されている。例えば
矩形状の薄膜19は、前記封口体12の上面に前記矩形
状穴18を覆うようにレーザ溶接によって気密に取り付
けられている。例えば直線部およびその両端をV字形に
した形状の溝20は、前記薄膜19上面に前記矩形状穴
18に対応するように形成されている。前記溝20底部
の前記薄膜19部分は、弁膜21として機能する。この
ような前記封口体12に開口された矩形状穴18、前記
薄膜19および前記溝20により前記薄膜19に形成さ
れた弁膜21に安全弁機構22を構成している。For example, a rectangular hole 18 is opened in the sealing body 12 at a desired distance from the hole 11. For example, a rectangular thin film 19 is hermetically attached to the upper surface of the sealing body 12 by laser welding so as to cover the rectangular hole 18. For example, a linear portion and a groove 20 having both ends formed in a V-shape are formed on the upper surface of the thin film 19 so as to correspond to the rectangular holes 18. The thin film 19 at the bottom of the groove 20 functions as the valve membrane 21. A safety valve mechanism 22 is constituted by the valve hole 21 formed in the thin film 19 by the rectangular hole 18 opened in the sealing body 12, the thin film 19 and the groove 20.
【0021】矩形状のPTC素子23は、前記外装缶1
の底面に導電性接着剤層(図示せず)を介して固定され
ている。例えばステンレスからなる端子板24は、前記
PTC素子23の底面に導電性接着剤層(図示せず)を
介して固定されている。The rectangular PTC element 23 is provided in the outer can 1.
Is fixed to the bottom surface of the substrate via a conductive adhesive layer (not shown). For example, a terminal plate 24 made of stainless steel is fixed to the bottom surface of the PTC element 23 via a conductive adhesive layer (not shown).
【0022】このような構成によれば、外装缶1内に電
極体2を底部4と前記底部4を支点にして傾動する対向
した一対の側壁5とを備えた形状をなす導電性カバー3
で包み込んだ状態で挿入することによって、挿入作業時
に前記導電性カバー3が挿入ガイドの役目を果たす。こ
のため、前記電極体2の挿入作業を簡素化することがで
きると共に、挿入作業を自動化することが可能になる。
また、前記挿入時の前記外装缶1と前記電極体2の干渉
による前記電極体2の底部及び外周部の損傷を前記導電
性カバー3により防止できるため、前記損傷に伴う電池
の内部短絡を防止することができる。According to such a configuration, the conductive cover 3 having a shape having the bottom 4 and the pair of opposed side walls 5 tilting around the bottom 4 as the fulcrum in the outer can 1.
The conductive cover 3 serves as an insertion guide at the time of insertion work. For this reason, the work of inserting the electrode body 2 can be simplified and the work of insertion can be automated.
In addition, since the conductive cover 3 can prevent the bottom and outer periphery of the electrode body 2 from being damaged by the interference between the outer can 1 and the electrode body 2 during the insertion, the internal short circuit of the battery due to the damage is prevented. can do.
【0023】また、前記外装缶1の上部開口部に取り付
けた封口体12に安全弁機構22を設ければ、短絡等の
原因によりガスが発生して電池内圧が上昇した場合、前
記安全弁機構22が動作してガスを外装缶の外部に逃散
できるため、前記電池内圧の過度の上昇に伴う外装缶の
破裂や変形を防止できる。すなわち、前記外装缶1内に
前記電極体2を前記導電性カバー3と共に挿入すると、
前記外装缶1と前記導電性カバー3との間に図3に示す
ように前記外装缶1のコーナ部に深さ方向にわたる空間
7が形成される。このため、リチウムイオン二次電池の
誤使用等によって、過充電状態や短絡状態になって前記
外装缶1内部にガスが発生した場合、前記ガスを前記空
間7を通して前記封口体12に取り付けた前記安全弁機
構22の弁膜21に確実に導くことができる。したがっ
て、前記安全弁機構22の弁膜21を確実に破断させて
ガスを前記外装缶1の外部に逃散できるため、前記電池
内圧の過度の上昇に伴う外装缶の破裂や変形を防止でき
る。Further, if a safety valve mechanism 22 is provided on the sealing body 12 attached to the upper opening of the outer can 1, if a gas is generated due to a short circuit or the like and the internal pressure of the battery rises, the safety valve mechanism 22 is opened. Since the gas can escape to the outside of the outer can by operating, the rupture or deformation of the outer can caused by the excessive increase in the internal pressure of the battery can be prevented. That is, when the electrode body 2 is inserted into the outer can 1 together with the conductive cover 3,
As shown in FIG. 3, a space 7 extending in the depth direction is formed between the outer can 1 and the conductive cover 3 at a corner portion of the outer can 1. Therefore, when a gas is generated inside the outer can 1 due to an overcharged state or a short-circuited state due to misuse of the lithium ion secondary battery or the like, the gas is attached to the sealing body 12 through the space 7. It can be reliably guided to the valve membrane 21 of the safety valve mechanism 22. Therefore, the valve membrane 21 of the safety valve mechanism 22 is reliably broken, and the gas can escape to the outside of the outer can 1, so that the outer can can be prevented from being ruptured or deformed due to an excessive increase in the internal pressure of the battery.
【0024】さらに、前記外装缶1の底面に矩形状のP
TC素子23を導電性接着剤層を介して固定すれば、過
電流時および短絡時に異常電流が流れて電池内部の温度
が上昇した場合、その熱を前記外装缶1底部に密着して
配置した前記PTC素子23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PTC素子23にも流
れる。したがって、前記PTC素子23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
って前記異常電流の流れを微小に制限できるため、電池
の過度の発熱を抑制することができる。Further, a rectangular P
If the TC element 23 is fixed via a conductive adhesive layer, when an abnormal current flows during an overcurrent and a short circuit and the temperature inside the battery rises, the heat is disposed in close contact with the bottom of the outer can 1. It can be transmitted to the PTC element 23 quickly. The abnormal current also flows through the PTC element 23. Therefore, if the temperature exceeds a predetermined temperature due to the positive characteristic of the PTC element 23, the resistance increases rapidly and the flow of the abnormal current can be minutely limited, so that excessive heat generation of the battery can be suppressed. it can.
【0025】[0025]
【発明の効果】以上詳述したように、本発明に係わるリ
チウムイオン二次電池によれば電極体を包み込む導電性
カバーを備えることによって、電極体の外装缶への挿入
性を改善できると同時に、内部にガス発生があった場合
でも確実に安全弁機構を作動させて安全性を確保できる
等顕著な効果を奏する。As described in detail above, according to the lithium ion secondary battery of the present invention, by providing the conductive cover for enclosing the electrode body, it is possible to improve the insertability of the electrode body into the outer can. Also, even when gas is generated in the inside, a remarkable effect is obtained such that the safety valve mechanism can be reliably operated to ensure safety.
【図1】本発明の実施例における角形リチウムイオン二
次電池を示す正面断面図。FIG. 1 is a front sectional view showing a prismatic lithium ion secondary battery according to an embodiment of the present invention.
【図2】図1の二次電池の上面図。FIG. 2 is a top view of the secondary battery in FIG.
【図3】図1のIII-III 線に沿う断面図。FIG. 3 is a sectional view taken along the line III-III of FIG. 1;
【図4】図1の二次電池の分解斜視図。FIG. 4 is an exploded perspective view of the secondary battery of FIG.
1…外装缶、2…電極体、3…導電性カバー、12…封
口体、16…正極ピン端子、18…矩形状穴、19…薄
膜、21…弁膜、22…安全弁機構、23…PTC素
子。DESCRIPTION OF SYMBOLS 1 ... Outer can, 2 ... Electrode body, 3 ... Conductive cover, 12 ... Sealing body, 16 ... Positive electrode pin terminal, 18 ... Rectangular hole, 19 ... Thin film, 21 ... Valve membrane, 22 ... Safety valve mechanism, 23 ... PTC element .
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 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 湊 康文 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 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 特開 平4−10361(JP,A) 特開 平4−206167(JP,A) (58)調査した分野(Int.Cl.7,DB名) H01M 10/40 Continued on the front page (72) Inventor Masamichi Kawabe 72 Horikawacho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Horikawacho Plant (72) Inventor Shigeo Kasahara 3-4-10 Minamishinagawa, Shinagawa-ku, Tokyo Toshiba Battery Incorporated (72) Inventor Yasufumi Minato 1-3-1 Yoko, Kawasaki-ku, Kawasaki-shi, Kanagawa Asahi Kasei Kogyo Co., Ltd. (72) Gen Takayama 3-4-1, Minamishinagawa, Shinagawa-ku, Tokyo Toshiba Battery (56) References JP-A-4-10361 (JP, A) JP-A-4-206167 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H01M 10/40
Claims (1)
電要素である電極体とを備えたリチウムイオン二次電池
において、 前記電極体は、底部を含む外周側面が導電性カバーで包
み込まれて前記外装缶内に挿入され、かつ前記導電性カ
バーは底部と前記底部を支点にして傾動する対向した一
対の側壁とを有する形状をなすことを特徴としたリチウ
ムイオン二次電池。1. A lithium ion secondary battery comprising an outer can and an electrode body which is a power generating element inserted into the outer can, wherein the electrode body has an outer peripheral side including a bottom wrapped with a conductive cover. The lithium ion secondary battery is characterized in that the conductive cover is inserted into the outer can and the conductive cover has a shape having a bottom and a pair of opposed side walls that tilt about the bottom.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29580992A JP3349529B2 (en) | 1992-11-05 | 1992-11-05 | Lithium ion secondary battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP29580992A JP3349529B2 (en) | 1992-11-05 | 1992-11-05 | Lithium ion secondary battery |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH06150974A JPH06150974A (en) | 1994-05-31 |
JP3349529B2 true JP3349529B2 (en) | 2002-11-25 |
Family
ID=17825450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP29580992A Expired - Fee Related JP3349529B2 (en) | 1992-11-05 | 1992-11-05 | Lithium ion secondary battery |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3349529B2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4789295B2 (en) * | 1998-11-09 | 2011-10-12 | 株式会社Gsユアサ | Sealed battery |
KR100544111B1 (en) * | 1999-03-22 | 2006-01-23 | 삼성에스디아이 주식회사 | Prismatic type secondary battery |
US6296967B1 (en) | 1999-09-24 | 2001-10-02 | Electrofuel Inc. | Lithium battery structure incorporating lithium pouch cells |
JP2008234868A (en) * | 2007-03-16 | 2008-10-02 | Hitachi Maxell Ltd | Nonaqueous electrolyte secondary battery and its manufacturing method |
JP5437133B2 (en) * | 2010-03-31 | 2014-03-12 | 古河電池株式会社 | Lithium ion battery and method for producing lithium ion battery |
JP7285809B2 (en) | 2020-08-12 | 2023-06-02 | プライムプラネットエナジー&ソリューションズ株式会社 | Prismatic battery manufacturing method and prismatic battery |
-
1992
- 1992-11-05 JP JP29580992A patent/JP3349529B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH06150974A (en) | 1994-05-31 |
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