JP3685723B2 - Secondary battery - Google Patents
Secondary battery Download PDFInfo
- Publication number
- JP3685723B2 JP3685723B2 JP2001059123A JP2001059123A JP3685723B2 JP 3685723 B2 JP3685723 B2 JP 3685723B2 JP 2001059123 A JP2001059123 A JP 2001059123A JP 2001059123 A JP2001059123 A JP 2001059123A JP 3685723 B2 JP3685723 B2 JP 3685723B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- terminal
- discharge
- terminal member
- electrode
- 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
Images
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
- Thermally Actuated Switches (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、電池缶の内部に収容された巻き取り電極体の発生電力を一対の電極端子部材から外部負荷に供給することが出来る二次電池に関し、特に、所定値を越える温度上昇が発生したときに電流経路を自動的に遮断する、自己復帰不能な温度ヒューズを具えた二次電池に関するものである。
【０００２】
【従来の技術】
従来、密閉された電池缶の内部に、所定値を越える温度上昇が発生したときに充放電経路を遮断する自己復帰不能な温度ヒューズを配備した二次電池が提案されている(特開平6-325751号)。
該二次電池によれば、発熱によって電池の温度が所定値を越えると、温度ヒューズが作動して、充放電経路を遮断するので、以後の充放電が強制的に停止されることになる。
【０００３】
【発明が解決しようとする課題】
しかしながら、従来の二次電池においては、温度ヒューズが電池缶の内部に配備されており、一旦、温度上昇によって作動すると、該温度ヒューズは自己復帰しないため、充放電経路をリセットするための特別な構成が必要となって、電池の構造が複雑となるばかりでなく、リセットの操作が困難である問題があった。
又、温度ヒューズが作動した時点で、電池に大きな電力が残存しているときは、該電力を放電する必要があるが、温度ヒューズが作動した状態では放電回路を構成することが出来ないため、従来においては、長時間の放置によって自己放電させる方法が採られており、時間がかかる問題があった。
【０００４】
そこで本発明の目的は、充放電経路のリセットが容易であり、然も温度ヒューズの作動時に残存電力を容易に放電させることが出来る二次電池を提供することである。
【０００５】
【課題を解決する為の手段】
本発明に係る二次電池においては、電池缶(11)の内部に巻き取り電極体(２)が収容され、電池缶(11)には、巻き取り電極体(２)の発生電力を外部負荷に供給するための一対の電極端子部材(31)(31)が取り付けられている。
ここで、電池缶(11)から外部に突出する少なくとも何れか一方の電極端子部材(31)の先端部には、所定値を越える温度上昇によって電流経路を遮断する自己復帰不能な温度ヒューズ(４)が連結されている。
温度ヒューズ(４)は、第１端子部材(41)と第２端子部材(42)の間に感温性部材(43)を介在させて構成され、第１端子部材(41)には電極端子部材(31)へ向けて第１ねじ軸部(41b)が突設され、該第１ねじ軸部(41b)が電極端子部材(31)の先端部にねじ込まれており、該第１端子部材 (41) には、温度ヒューズ ( ４ ) の作動時に残存電力を放電するために用いる放電用端子片 ( ５ ) が連結されている。又、第２端子部材(42)には、第１ねじ軸部とは逆方向に第２ねじ軸部(42b)が突設され、該第２ねじ軸部(42b)に対して、外部負荷との接続に用いる端子片(51)が連結されると共に接続用ナット(６)が螺合し、該接続用ナット(６)の締め付けによって端子片(51)が第２端子部材(42)に固定されている。
【０００６】
上記本発明の二次電池においては、所定値を越える温度上昇が発生したとき、温度ヒューズ(４)の感温性部材(43)が変形して、第１端子部材(41)と第２端子部材(42)の間の電気的導通を切り離す。これによって、電極端子部材(31)から端子片(51)へ至る充放電経路が強制的に遮断されることになる。
温度ヒューズ(４)の作動後、二次電池の残存電力を放電させる場合には、該温度ヒューズ(４)の第１端子部材(41)に放電回路を接続すればよい。又、充放電経路をリセットする際は、作動状態の温度ヒューズ(４)を電極端子部材(31)から取り外し、未作動状態の温度ヒューズと交換すればよく、その作業は容易である。
【０００７】
又、上記本発明の二次電池においては、温度ヒューズ(４)が、第１端子部材(41)と第２端子部材(42)にそれぞれ第１ねじ軸部(41b)と第２ねじ軸部(42b)を突設した構成を有しているので、従来構造の電極端子部材(31)に大きな改変を加えることなく、第１端子部材(41)のねじ軸部(41b)を電極端子部材(31)の先端部に連結することが可能であると共に、第２端子部材(42)のねじ軸部(42b)に対し、従来と同様に接続用ナット(６)を螺合せしめて、電力取出し用の端子片(51)を固定することが可能である。
【０００８】
又、温度ヒューズ ( ４ ) の第１端子部材 (41) には放電用端子片 ( ５ ) が連結されているので、該放電用端子片 ( ５ ) を用いて、温度ヒューズ ( ４ ) の作動時に電池の残存電力を放電させることが出来る。
具体的には、前記放電用端子片(５)には、オン／オフ操作可能な放電スイッチ(７)と放電抵抗(71)を具えた放電回路が接続されている。
該具体的構成によれば、通常の充放電時には放電スイッチ(７)を開いておき、温度ヒューズ(４)の作動時に、放電スイッチ(７)を閉じる。これによって、放電回路が動作し、放電抵抗(71)によって巻き取り電極体(２)の残存電力が短時間で消費される。
【０００９】
【発明の効果】
本発明に係る二次電池によれば、温度ヒューズ作動後に充放電経路をリセットする操作が容易であり、然も、温度ヒューズの作動時に残存している電力を容易に放電させることが可能である。
【００１０】
【発明の実施の形態】
以下、本発明をリチウム二次電池に実施した形態につき、図面に沿って具体的に説明する。
本発明に係るリチウム二次電池は、図１及び図２に示す如く、円筒型の電池本体(１)を具え、該電池本体(１)には、正負一対の電極端子機構(３)(３)が取り付けられており、これらの電極端子機構(３)(３)から外部に電力を取り出すことが可能である。
【００１１】
電池本体(１)は、図３に示す如く、筒体(12)の開口部に蓋体(13)を固定してなる電池缶(11)の内部に、巻き取り電極体(２)を収容して構成されており、蓋体(13)には、電池缶(11)内部の圧力が所定値を上回ったときに開放するガス排出弁(14)が取り付けられている。
又、蓋体(13)には、図２に示す如く、電池缶(11)の内部に電解液を注入するために用いた注液孔を塞ぐ封口栓(15)がねじ込まれている。
【００１２】
電極端子機構(３)は、図３に示す如く、蓋体(13)の貫通孔に取り付けられた電極端子部材(31)を具え、該貫通孔と電極端子部材(31)の間には、絶縁部材(33)が介在している。電極端子部材(31)は、電池缶(11)の内部に鍔部(34)を具えると共に、電池缶(11)の外部へ向けて突出するねじ軸部(31a)を具えており、該ねじ軸部(31a)にナット(35)を螺合せしめて、電極端子部材(31)を蓋体(13)に固定している。
又、電極端子部材(31)の鍔部(34)には、巻き取り電極体(２)から伸びる複数本の集電タブ(21)が連結されて、巻き取り電極体(２)と電極端子部材(31)の間の電気的導通がとられている。
【００１３】
図２に示す如く、正負一対の電極端子機構(３)(３)の内、一方の電極端子機構(３)の電極端子部材(31)には、所定値を越える温度上昇によって電流経路を遮断する自己復帰不能な温度ヒューズ(４)がねじ込まれる。
温度ヒューズ(４)は、図４及び図５に示す如く、第１端子部材(41)及び第２端子部材(42)の間に感温性部材(43)を介在させ、これらを円筒状の絶縁部材(44)によって連結し、更にその周囲を金属リング(45)によって包囲したものであり、金属リング(45)の両端部をかしめ固定することによって、一体の温度ヒューズ(４)を構成している。第１端子部材(41)及び第２端子部材(42)はそれぞれ、円板部(41a)(42a)の表面にねじ軸部(41b)(42b)を互いに逆方向に突設したものである。又、感温性部材(43)は形状記憶合金製であって、平板部(43a)及び切り起こし部(43b)から構成され、所定温度以下では、平板部(43a)が第１端子部材(41)に接触すると共に、切り起こし部(43b)の先端が第２端子部材(42)に接触して、第１端子部材(41)と第２端子部材(42)の電気的導通を維持しているが、所定温度を越えると、切り起こし部(43b)が変形して第２端子部材(42)から離間し、第１端子部材(41)と第２端子部材(42)の電気的導通を遮断するものである。尚、該感温性部材(43)は、温度が所定値以下に戻ったとしても、自己復帰はしない。
【００１４】
図２及び図４に示す如く、温度ヒューズ(４)の第１端子部材(41)のねじ軸部(41b)には、ワイヤー(53)が接続されたリング状の放電用端子片(５)が係合し、該ねじ軸部(41b)は、電極端子部材(31)の先端部に凹設されたねじ穴(31a)にねじ込まれる。又、温度ヒューズ(４)の第２端子部材(42)のねじ軸部(42b)には、ワイヤー(54)が接続された電力取り出し用端子片(51)が係合すると共に、接続用ナット(６)が螺合する。
尚、温度ヒューズ(４)の金属リング(45)の表面には、絶縁フィルム(図示省略)が貼り付けられており、放電用端子片(５)と電力取り出し用端子片(51)との間には、感温性部材(43)を通じてのみ電気的導通が得られる様にしている。
更に、図２に示す如く、他方の電極端子機構(３)の電極端子部材(31)のねじ軸部(31a)には、ワイヤー(55)が接続された電力取出し用端子片(52)が係合すると共に、接続用ナット(61)が螺合する。
【００１５】
図１に示す様に、一方の電極端子機構(３)に取り付けられた放電用端子片(５)から伸びるワイヤー(53)は、電流遮断素子(72)、放電スイッチ(７)及び放電抵抗(71)を介して、他方の電極端子機構(３)に取り付けられた電力取出し用端子片(52)から伸びるワイヤー(55)と連結されて、温度ヒューズ(４)が作動したときの残存電力を放電するための放電回路が形成されている。
尚、電流遮断素子(72)は、放電回路を流れる電流が所定の閾値(０.２５Ｃ)を越えたときに電流経路を遮断するヒューズ、若しくは正の温度係数を有するＰＴＣ素子から構成される。
【００１６】
更に図６は、電池本体(１)から外部負荷(８)へ電力を供給し、或いは充電器(81)によって電池本体(１)を充電するための充放電回路を、一対の電力取出し用端子片(51)(52)に接続した状態を表わしており、該充放電回路には、電力供給時に閉じるべき給電スイッチ(82)と、充電時に閉じるべき充電スイッチ(83)が介在している。
又、放電用端子片(５)と電力取出し用端子片(52)に接続された放電回路に対して並列に、両端子片(５)(52)間の電圧をモニターするための電圧モニター(73)が接続されている。
【００１７】
上記本発明のリチウム二次電池においては、電池本体(１)から負荷(８)に電力を供給し、或いは充電器(81)によって電池本体(１)を充電している過程で、電池本体(１)の温度が所定値を越えて上昇したとき、温度ヒューズ(４)が作動して、充放電回路が強制的に開かれることになる。
この状態で、放電回路の放電スイッチ(７)を閉じることにより、電池本体(１)に残存している電力が放電抵抗(71)によって消費される。
【００１８】
【実施例】
上記本発明のリチウム二次電池(本発明電池)を実際に作製して、その動作を確認した。
【００１９】
先ず、本発明電池の電池本体(１)の製造方法について説明する。
〔正極の作製〕
正極活物質としてのＬｉＮｉ０．７Ｃｏ０．３Ｏ２と導電剤としての炭素を、重量比９０：５で混合して、正極合剤を作製した。次に、結着剤であるポリフッ化ビニリデンをＮ−メチル−２−ピロリドン（ＮＭＰ）に溶解させて、ＮＭＰ溶液を調製した。そして、正極合剤とポリフッ化ビニリデンの重量比が９５：５になる様に、正極合剤とＮＭＰ溶液を混練してスラリーを調製した。このスラリーを正極集電体としてのアルミニウム箔の両面にドクターブレード法により塗布し、１５０℃で２時間の真空乾燥を施して、正極を得た。
【００２０】
〔負極の作製〕
結着剤であるポリフッ化ビニリデンをＮＭＰに溶解させて、ＮＭＰ溶液を調製した。そして、黒鉛粉末とハードカーボン粉末を重量比４：１で混合した粉末とポリフッ化ビニリデンの重量比が９５：５になる様に、粉末とＮＭＰ溶液とを混練してスラリーを調製した。このスラリーを負極集電体としての銅箔の両面にドクターブレード法により塗布し、１５０℃で２時間の真空乾燥を施して、負極を得た。
【００２１】
〔電解液の調製〕
エチレンカーボネートとジエチルカーボネートを体積比１：１で混合した溶媒に、ＬｉＰＦ６を１ｍｏｌ／ｌの割合で溶解して、電解液を調製した。
【００２２】
〔電池の組立〕
正極に対してアルミニウム製の複数本の集電タブを接続すると共に、負極に対して銅製の複数本の集電タブを接続した後、正極と負極の間にセパレータを介在させてこれらを渦巻き状に巻き取って、巻き取り電極体を作製した。尚、セパレータとしては、イオン透過性のポリエチレン製の微多孔膜を用いた。
【００２３】
一方、外径４２.５ｍｍ、高さ１５０ｍｍ、厚さ０.５ｍｍの金属製筒体と、直径４２.５ｍｍ、厚さ２ｍｍの一対の金属製蓋体とを作製し、両蓋体にそれぞれ電極端子機構を取り付けた。そして、巻き取り電極を筒体の内部に収容して、該巻き取り電極体の両極から伸びる集電タブをそれぞれ電極端子機構に接続した後、各蓋体を筒体の開口縁に溶接し、内部に電解液を注入して、電池本体を組み立てた。
【００２４】
その後、図１の如く、一方(正極側)の電極端子機構(３)の電極端子部材(31)に温度ヒューズ(４)をねじ込んで固定すると共に、放電用端子片(５)と一対の電力取出し用端子片(51)(52)を取り付けた。尚、温度ヒューズ(４)としては、作動温度が５０℃のものを採用した。
【００２５】
一方、放電用端子片(５)に放電回路が接続されていないこと以外は上記本発明電池と同様にして、比較例電池を作製し、本発明電池と比較例電池について、以下の動作確認試験を行なった。
【００２６】
先ず、電池の容量を確認した。そして、充電電流１.８７５Ａで８時間の充電を行なった後、放電電流１.８７５Ａで放電終止電圧２.７Ｖまで放電を行なった。この結果、電池の放電容量は、本発明電池及び比較例電池ともに１５Ａｈであった。尚、電池の表面温度を把握するため、電池缶の表面に温度センサーを取り付けて、電池温度を常時モニターした。
【００２７】
次に、温度ヒューズの動作試験を行なった。試験では、形状及び熱容量に関して本発明電池及び比較例電池と同等の２つの模擬電池を作製し、これらの模擬電池にヒータを巻き付けて、温度ヒューズを取り付けた端子部の温度が５０℃以上になる様に加熱し、加熱前後の温度ヒューズの導通（抵抗測定）をテスターで測定した。その結果、本発明電池及び比較例電池ともに、温度が５０℃に到達することによって、温度ヒューズが作動し、充放電回路が遮断されたことを確認した。
【００２８】
その後、作動後の温度ヒューズを本発明電池に取り付け、図６に示す電圧モニター(73)が接続された放電回路を構成した。この結果、電圧モニター(73)は電圧表示が可能であって、電池本体(１)からの放電が可能であることを確認した。
又、本発明電池において、両電力取出し用端子片(51)(52)間の電圧は、充放電回路が遮断されているために零となり、放電が不能であることを確認した。
【００２９】
上述の如く、本発明に係るリチウム二次電池によれば、電池の温度上昇によって温度ヒューズ(４)が作動した後に、電池本体(１)に残存していた電力を放電用端子片(５)に接続した放電回路によって放電させることが可能となる。
又、放電回路に配備した放電スイッチ(７)を遠隔制御することによって、電池本体(１)から離れた遠隔位置から残存電力の放電を行なうことが出来る。
更に、温度ヒューズ(４)は、電池缶(11)の外側に配備されて、電極端子部材(31)の端部にねじ込み固定されているに過ぎないので、新しい温度ヒューズと交換する作業が極めて簡易である。
【図面の簡単な説明】
【図１】本発明に係る二次電池の外観を示す正面図である。
【図２】該二次電池において、電池本体から温度ヒューズを分解した状態を示す斜視図である。
【図３】該二次電池の要部を示す断面図である。
【図４】温度ヒューズの断面図である。
【図５】温度ヒューズの分解斜視図である。
【図６】電池本体に接続された充放電回路及び放電回路を示す図である。
【符号の説明】
(１) 電池本体
(11) 電池缶
(12) 筒体
(13) 蓋体
(２) 巻き取り電極体
(３) 電極端子機構
(31) 電極端子部材
(４) 温度ヒューズ
(41) 第１端子部材
(42) 第２端子部材
(43) 感温性部材
(５) 放電用端子片
(51) 電力取出し用端子片
(52) 電力取出し用端子片
(６) 接続用ナット
(61) 接続用ナット
(７) 放電スイッチ
(71) 放電抵抗
(72) 電流遮断素子
(73) 電圧モニター[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a secondary battery that can supply electric power generated by a take-up electrode body accommodated in a battery can to an external load from a pair of electrode terminal members, and in particular, a temperature rise exceeding a predetermined value has occurred. The present invention relates to a secondary battery having a temperature fuse that automatically cuts off a current path and cannot self-recover.
[0002]
[Prior art]
Conventionally, there has been proposed a secondary battery in which a temperature fuse that is not self-recoverable and that shuts off a charge / discharge path when a temperature rise exceeding a predetermined value occurs inside a sealed battery can (Japanese Patent Laid-Open No. 6-1994). 325751).
According to the secondary battery, when the temperature of the battery exceeds a predetermined value due to heat generation, the thermal fuse is activated to cut off the charge / discharge path, so that the subsequent charge / discharge is forcibly stopped.
[0003]
[Problems to be solved by the invention]
However, in the conventional secondary battery, a thermal fuse is provided inside the battery can, and once the thermal fuse is activated due to a temperature rise, the thermal fuse does not self-recover, so that a special charge for resetting the charge / discharge path is provided. There is a problem that not only the structure of the battery becomes complicated due to the need for the configuration, but also the reset operation is difficult.
In addition, when a large amount of power remains in the battery when the thermal fuse is activated, it is necessary to discharge the electric power, but a discharge circuit cannot be configured in a state where the thermal fuse is activated. Conventionally, a method of self-discharge by leaving for a long time has been adopted, and there is a problem that it takes time.
[0004]
Accordingly, an object of the present invention is to provide a secondary battery in which the charge / discharge path can be easily reset and the remaining power can be easily discharged when the thermal fuse is operated.
[0005]
[Means for solving the problems]
In the secondary battery according to the present invention, the winding electrode body (2) is accommodated in the battery can (11), and the battery can (11) receives the electric power generated by the winding electrode body (2) as an external load. A pair of electrode terminal members (31) and (31) for supplying to the battery are attached.
Here, at the tip of at least one of the electrode terminal members (31) protruding outside from the battery can (11), a self-recoverable temperature fuse (4) that interrupts the current path due to a temperature rise exceeding a predetermined value. ) Are connected.
The thermal fuse (4) is configured by interposing a temperature sensitive member (43) between the first terminal member (41) and the second terminal member (42), and the first terminal member (41) has an electrode terminal. A first screw shaft portion (41b) protrudes toward the member (31), and the first screw shaft portion (41b) is screwed into a distal end portion of the electrode terminal member (31) . Connected to (41) is a discharge terminal piece ( 5 ) used for discharging the remaining power when the thermal fuse ( 4 ) is operated . The second terminal member (42) is provided with a second screw shaft portion (42b) projecting in the direction opposite to the first screw shaft portion, and an external load is applied to the second screw shaft portion (42b). The terminal piece (51) used for the connection is connected, and the connecting nut (6) is screwed. The terminal piece (51) is fastened to the second terminal member (42) by tightening the connecting nut (6). It is fixed.
[0006]
In the secondary battery of the present invention, when a temperature rise exceeding a predetermined value occurs, the temperature sensitive member (43) of the thermal fuse (4) is deformed, and the first terminal member (41) and the second terminal are deformed. Disconnect electrical continuity between members (42). As a result, the charge / discharge path from the electrode terminal member (31) to the terminal piece (51) is forcibly blocked.
When the remaining power of the secondary battery is discharged after the thermal fuse (4) is actuated, a discharge circuit may be connected to the first terminal member (41) of the thermal fuse (4). Further, when resetting the charging / discharging path, the temperature fuse (4) in the activated state may be removed from the electrode terminal member (31) and replaced with the temperature fuse in the inactivated state, and the operation is easy.
[0007]
In the secondary battery of the present invention, the thermal fuse (4) is provided on the first terminal member (41) and the second terminal member (42), respectively, with the first screw shaft portion (41b) and the second screw shaft portion. (42b) has a configuration in which the screw terminal portion (41b) of the first terminal member (41) is connected to the electrode terminal member without greatly modifying the electrode terminal member (31) of the conventional structure. It can be connected to the tip of (31), and the connecting nut (6) is screwed into the screw shaft (42b) of the second terminal member (42) in the same manner as in the prior art to take out the power. It is possible to fix the terminal piece (51) for use.
[0008]
In addition, since the thermal fuse (4) first discharging terminal piece to the terminal member (41) in (5) is connected, using the discharge terminal piece (5), the operation of the thermal fuse (4) Sometimes the remaining power of the battery can be discharged.
Specifically, a discharge circuit including a discharge switch (7) that can be turned on / off and a discharge resistor (71) is connected to the discharge terminal piece (5).
According to this specific configuration, the discharge switch (7) is opened during normal charging and discharging, and the discharge switch (7) is closed when the thermal fuse (4) is activated. As a result, the discharge circuit operates, and the remaining power of the winding electrode body (2) is consumed in a short time by the discharge resistor (71).
[0009]
【The invention's effect】
According to the secondary battery of the present invention, it is easy to reset the charge / discharge path after the thermal fuse is activated, and it is possible to easily discharge the remaining electric power when the thermal fuse is activated. .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention applied to a lithium secondary battery will be described in detail with reference to the drawings.
The lithium secondary battery according to the present invention includes a cylindrical battery body (1) as shown in FIGS. 1 and 2, and the battery body (1) includes a pair of positive and negative electrode terminal mechanisms (3) (3). ) Is attached, and electric power can be taken out from these electrode terminal mechanisms (3) and (3).
[0011]
As shown in FIG. 3, the battery body (1) accommodates the winding electrode body (2) in the battery can (11) formed by fixing the lid (13) to the opening of the cylindrical body (12). A gas discharge valve (14) that is opened when the pressure inside the battery can (11) exceeds a predetermined value is attached to the lid (13).
Further, as shown in FIG. 2, the lid (13) is screwed with a sealing plug (15) for closing the liquid injection hole used for injecting the electrolyte into the battery can (11).
[0012]
As shown in FIG. 3, the electrode terminal mechanism (3) includes an electrode terminal member (31) attached to the through hole of the lid (13), and between the through hole and the electrode terminal member (31), An insulating member (33) is interposed. The electrode terminal member (31) includes a collar portion (34) inside the battery can (11) and a screw shaft portion (31a) protruding toward the outside of the battery can (11). A nut (35) is screwed onto the screw shaft portion (31a) to fix the electrode terminal member (31) to the lid (13).
In addition, a plurality of current collecting tabs (21) extending from the take-up electrode body (2) are connected to the collar part (34) of the electrode terminal member (31), and the take-up electrode body (2) and the electrode terminal are connected. Electrical continuity is established between the members (31).
[0013]
As shown in FIG. 2, of the pair of positive and negative electrode terminal mechanisms (3) and (3), the electrode terminal member (31) of one of the electrode terminal mechanisms (3) is blocked by a temperature rise exceeding a predetermined value. The self-recoverable temperature fuse (4) is screwed.
As shown in FIGS. 4 and 5, the thermal fuse (4) has a temperature-sensitive member (43) interposed between the first terminal member (41) and the second terminal member (42), which are cylindrically shaped. It is connected by an insulating member (44) and is surrounded by a metal ring (45). By caulking and fixing both ends of the metal ring (45), an integrated thermal fuse (4) is constructed. ing. The first terminal member (41) and the second terminal member (42) are formed by projecting screw shaft portions (41b) (42b) in opposite directions on the surfaces of the disk portions (41a) (42a), respectively. . The temperature sensitive member (43) is made of a shape memory alloy, and is composed of a flat plate portion (43a) and a cut-and-raised portion (43b). The flat plate portion (43a) is a first terminal member (below a predetermined temperature). 41) and the tip of the cut-and-raised part (43b) contacts the second terminal member (42) to maintain electrical continuity between the first terminal member (41) and the second terminal member (42). However, when the predetermined temperature is exceeded, the cut-and-raised portion (43b) is deformed and separated from the second terminal member (42), and the first terminal member (41) and the second terminal member (42) are electrically connected. Is to shut off. The temperature-sensitive member (43) does not self-recover even when the temperature returns to a predetermined value or less.
[0014]
2 and 4, a ring-shaped discharge terminal piece (5) in which a wire (53) is connected to the screw shaft part (41b) of the first terminal member (41) of the thermal fuse (4). Are engaged, and the screw shaft portion (41b) is screwed into a screw hole (31a) recessed in the tip portion of the electrode terminal member (31). In addition, the screw shaft portion (42b) of the second terminal member (42) of the thermal fuse (4) is engaged with the power extraction terminal piece (51) to which the wire (54) is connected, and the connection nut. (6) is screwed together.
An insulating film (not shown) is affixed to the surface of the metal ring (45) of the thermal fuse (4) between the discharge terminal piece (5) and the power extraction terminal piece (51). In other words, electrical conduction is obtained only through the temperature sensitive member (43).
Further, as shown in FIG. 2, a power extraction terminal piece (52) to which a wire (55) is connected is connected to the screw shaft portion (31a) of the electrode terminal member (31) of the other electrode terminal mechanism (3). At the same time, the connecting nut (61) is screwed.
[0015]
As shown in FIG. 1, a wire (53) extending from a discharge terminal piece (5) attached to one electrode terminal mechanism (3) consists of a current interruption element (72), a discharge switch (7) and a discharge resistor ( 71) is connected to the wire (55) extending from the power extraction terminal piece (52) attached to the other electrode terminal mechanism (3), and the remaining power when the thermal fuse (4) is activated is connected. A discharge circuit for discharging is formed.
The current interrupting element (72) is composed of a fuse that interrupts the current path when the current flowing through the discharge circuit exceeds a predetermined threshold (0.25 C), or a PTC element having a positive temperature coefficient.
[0016]
Further, FIG. 6 shows a charge / discharge circuit for supplying power from the battery body (1) to the external load (8) or charging the battery body (1) by the charger (81). The charging / discharging circuit includes a power supply switch (82) that should be closed when power is supplied and a charge switch (83) that should be closed when charging.
In addition, a voltage monitor for monitoring the voltage between the terminal pieces (5) and (52) in parallel with the discharge circuit connected to the discharge terminal piece (5) and the power extraction terminal piece (52). 73) is connected.
[0017]
In the above-described lithium secondary battery of the present invention, in the process of supplying power from the battery body (1) to the load (8) or charging the battery body (1) by the charger (81), When the temperature of 1) rises above a predetermined value, the thermal fuse (4) is activated and the charge / discharge circuit is forcibly opened.
In this state, by closing the discharge switch (7) of the discharge circuit, the power remaining in the battery body (1) is consumed by the discharge resistor (71).
[0018]
【Example】
The lithium secondary battery of the present invention (the battery of the present invention) was actually fabricated and its operation was confirmed.
[0019]
First, a method for producing the battery body (1) of the battery of the present invention will be described.
[Production of positive electrode]
LiNi 0.7 Co 0.3 O 2 as a positive electrode active material and carbon as a conductive agent were mixed at a weight ratio of 90: 5 to prepare a positive electrode mixture. Next, polyvinylidene fluoride as a binder was dissolved in N-methyl-2-pyrrolidone (NMP) to prepare an NMP solution. Then, the positive electrode mixture and the NMP solution were kneaded so that the weight ratio of the positive electrode mixture and polyvinylidene fluoride was 95: 5 to prepare a slurry. This slurry was applied to both surfaces of an aluminum foil as a positive electrode current collector by a doctor blade method, and vacuum dried at 150 ° C. for 2 hours to obtain a positive electrode.
[0020]
(Production of negative electrode)
Polyvinylidene fluoride as a binder was dissolved in NMP to prepare an NMP solution. Then, the powder and the NMP solution were kneaded so that the weight ratio of graphite powder and hard carbon powder mixed at a weight ratio of 4: 1 to polyvinylidene fluoride was 95: 5 to prepare a slurry. This slurry was applied to both surfaces of a copper foil as a negative electrode current collector by a doctor blade method and vacuum dried at 150 ° C. for 2 hours to obtain a negative electrode.
[0021]
(Preparation of electrolyte)
LiPF 6 was dissolved at a ratio of 1 mol / l in a solvent in which ethylene carbonate and diethyl carbonate were mixed at a volume ratio of 1: 1 to prepare an electrolytic solution.
[0022]
[Battery assembly]
A plurality of aluminum current collecting tabs are connected to the positive electrode, and a plurality of copper current collecting tabs are connected to the negative electrode, and then a separator is interposed between the positive electrode and the negative electrode to form a spiral. And wound up into a wound electrode body. As the separator, an ion-permeable polyethylene microporous membrane was used.
[0023]
On the other hand, a metal cylinder having an outer diameter of 42.5 mm, a height of 150 mm, and a thickness of 0.5 mm and a pair of metal lids having a diameter of 42.5 mm and a thickness of 2 mm were prepared. A terminal mechanism was attached. And after accommodating the winding electrode in the inside of the cylindrical body and connecting the current collecting tabs extending from both poles of the winding electrode body to the respective electrode terminal mechanisms, each lid is welded to the opening edge of the cylindrical body, The battery body was assembled by injecting electrolyte into the interior.
[0024]
Thereafter, as shown in FIG. 1, the thermal fuse (4) is screwed and fixed to the electrode terminal member (31) of one (positive electrode side) electrode terminal mechanism (3), and the discharge terminal piece (5) and a pair of electric power are fixed. Extraction terminal pieces (51) and (52) were attached. As the thermal fuse (4), one having an operating temperature of 50 ° C. was used.
[0025]
On the other hand, a comparative battery was prepared in the same manner as the battery of the present invention except that the discharge circuit was not connected to the discharge terminal piece (5), and the following operation confirmation test was performed on the battery of the present invention and the comparative battery. Was done.
[0026]
First, the capacity of the battery was confirmed. Then, after charging for 8 hours at a charging current of 1.875 A, discharging was performed to a final discharge voltage of 2.7 V at a discharging current of 1.875 A. As a result, the discharge capacity of the battery was 15 Ah for both the battery of the present invention and the comparative battery. In order to grasp the surface temperature of the battery, a temperature sensor was attached to the surface of the battery can, and the battery temperature was constantly monitored.
[0027]
Next, an operation test of the thermal fuse was performed. In the test, two simulated batteries that are equivalent to the battery of the present invention and the comparative battery in terms of shape and heat capacity were prepared, and a heater was wound around these simulated batteries, and the temperature of the terminal portion to which the thermal fuse was attached was 50 ° C. or higher. In this manner, the continuity (resistance measurement) of the thermal fuse before and after heating was measured with a tester. As a result, it was confirmed that when the temperature of the present invention battery and the comparative example battery reached 50 ° C., the thermal fuse was activated and the charge / discharge circuit was shut off.
[0028]
After that, a temperature fuse after operation was attached to the battery of the present invention to constitute a discharge circuit to which the voltage monitor (73) shown in FIG. 6 was connected. As a result, it was confirmed that the voltage monitor (73) can display a voltage and discharge from the battery body (1).
Further, in the battery of the present invention, it was confirmed that the voltage between both power extraction terminal pieces (51) and (52) became zero because the charge / discharge circuit was cut off, and discharge was impossible.
[0029]
As described above, according to the lithium secondary battery of the present invention, after the thermal fuse (4) is activated due to the temperature rise of the battery, the power remaining in the battery body (1) is transferred to the discharge terminal piece (5). It is possible to discharge by a discharge circuit connected to the.
Further, by remotely controlling the discharge switch (7) provided in the discharge circuit, the remaining power can be discharged from a remote position away from the battery body (1).
Furthermore, since the thermal fuse (4) is provided outside the battery can (11) and is only screwed and fixed to the end of the electrode terminal member (31), it is extremely difficult to replace it with a new thermal fuse. It is simple.
[Brief description of the drawings]
FIG. 1 is a front view showing an external appearance of a secondary battery according to the present invention.
FIG. 2 is a perspective view showing a state in which a thermal fuse is disassembled from a battery body in the secondary battery.
FIG. 3 is a cross-sectional view showing a main part of the secondary battery.
FIG. 4 is a cross-sectional view of a thermal fuse.
FIG. 5 is an exploded perspective view of a thermal fuse.
FIG. 6 is a diagram showing a charge / discharge circuit and a discharge circuit connected to the battery body.
[Explanation of symbols]
(1) Battery body
(11) Battery can
(12) Tube
(13) Lid
(2) Winding electrode body
(3) Electrode terminal mechanism
(31) Electrode terminal member
(4) Thermal fuse
(41) First terminal member
(42) Second terminal member
(43) Temperature sensitive material
(5) Discharge terminal strip
(51) Power strip terminal
(52) Terminal strip for power extraction
(6) Connecting nut
(61) Connection nut
(7) Discharge switch
(71) Discharge resistance
(72) Current interrupt device
(73) Voltage monitor
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001059123A JP3685723B2 (en) | 2001-03-02 | 2001-03-02 | Secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001059123A JP3685723B2 (en) | 2001-03-02 | 2001-03-02 | Secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002260631A JP2002260631A (en) | 2002-09-13 |
| JP3685723B2 true JP3685723B2 (en) | 2005-08-24 |
Family
ID=18918739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001059123A Expired - Fee Related JP3685723B2 (en) | 2001-03-02 | 2001-03-02 | Secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3685723B2 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100899282B1 (en) * | 2006-07-18 | 2009-05-27 | 주식회사 엘지화학 | Safety Switch Using Heat Shrinkage Tube and Secondary Battery Including the Same |
| JP4974734B2 (en) | 2006-10-10 | 2012-07-11 | 三星エスディアイ株式会社 | Secondary battery and secondary battery module |
| KR100814882B1 (en) | 2006-10-10 | 2008-03-18 | 삼성에스디아이 주식회사 | Rechargeable battery and battery module formed by the rechargeable battery |
| US8097208B2 (en) | 2009-08-12 | 2012-01-17 | G&W Electric Company | White copper-base alloy |
| US8916287B2 (en) | 2010-08-16 | 2014-12-23 | Samsung Sdi Co., Ltd. | Rechargeable battery |
| WO2012048652A1 (en) | 2010-10-16 | 2012-04-19 | Byd Company Limited | Lithium-ion battery |
| KR20130040576A (en) | 2011-10-14 | 2013-04-24 | 삼성에스디아이 주식회사 | Rechargeable battery |
| JP5582128B2 (en) * | 2011-11-04 | 2014-09-03 | トヨタ自動車株式会社 | Secondary battery |
| JP5578371B2 (en) * | 2011-11-09 | 2014-08-27 | トヨタ自動車株式会社 | Sealed battery and discharge method thereof |
| JP5578372B2 (en) * | 2011-11-09 | 2014-08-27 | トヨタ自動車株式会社 | Sealed battery |
| JP5834919B2 (en) * | 2012-01-04 | 2015-12-24 | 株式会社豊田自動織機 | Power storage device and vehicle |
| JP6198129B2 (en) | 2013-09-30 | 2017-09-20 | 株式会社Ｇｓユアサ | Electricity storage element |
| JP6149719B2 (en) * | 2013-12-17 | 2017-06-21 | 住友電気工業株式会社 | Molten salt battery |
-
2001
- 2001-03-02 JP JP2001059123A patent/JP3685723B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002260631A (en) | 2002-09-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2827408B1 (en) | Lithium-ion rechargeable battery | |
| JP3685723B2 (en) | Secondary battery | |
| JP3557748B2 (en) | Sealed non-aqueous secondary battery | |
| JP5369342B1 (en) | Laminated battery, assembled battery including laminated battery, and assembling method of laminated battery | |
| US20100233524A1 (en) | Cylindrical non-aqueous electrolyte secondary battery | |
| KR100662174B1 (en) | Nonaqueous electrolyte secondary battery | |
| JP2004273139A (en) | Lithium secondary battery | |
| JP3511698B2 (en) | Sealed non-aqueous secondary battery | |
| JP5171441B2 (en) | Sealed secondary battery | |
| JP3574843B2 (en) | Lithium secondary battery with safety mechanism | |
| JP2989313B2 (en) | Battery device having protection element | |
| JP2000067847A (en) | Secondary battery and assembled battery | |
| JP2009059571A (en) | Current collector for battery, and battery using this | |
| JP2015037018A (en) | Sealed type nonaqueous electrolyte secondary battery | |
| JP4751500B2 (en) | Electrode wound type secondary battery | |
| JP2002246012A (en) | Non-aqueous electrolyte secondary battery | |
| JP3960766B2 (en) | Secondary battery | |
| JP2003243037A (en) | Lithium ion battery | |
| JP4670170B2 (en) | Nonaqueous electrolyte secondary battery | |
| JPH10247488A (en) | Nonaqueous electrolyte secondary battery | |
| JP2004253159A (en) | Nonaqueous electrolyte secondary battery | |
| JP4280349B2 (en) | Organic electrolyte secondary battery | |
| JP2006040772A (en) | Lithium ion battery | |
| JP2008110058A (en) | Hair iron | |
| JPH07272764A (en) | Nonaqueous electrolytic secondary battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20050225 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20050308 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20050415 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20050517 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20050531 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080610 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090610 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100610 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100610 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110610 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110610 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120610 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120610 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130610 Year of fee payment: 8 |
|
| LAPS | Cancellation because of no payment of annual fees |