JP2004199995A

JP2004199995A - Sealed battery

Info

Publication number: JP2004199995A
Application number: JP2002366913A
Authority: JP
Inventors: Koichi Zama; 浩一座間; Hideto Watanabe; 英人渡邉
Original assignee: NEC Tokin Tochigi Ltd; NEC Tokin Corp
Current assignee: Tokin Corp
Priority date: 2002-12-18
Filing date: 2002-12-18
Publication date: 2004-07-15
Anticipated expiration: 2022-12-18
Also published as: JP4293512B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sealed battery capable of being surely sealed with a flexible member as an outer packaging material. <P>SOLUTION: Of the sealed battery with the flexible member 2 as an outer packaging material, electrode terminal plates 4a, 4b connected to a battery element 3 penetrate through-holes fitted to the flexible member, and the flexible member and the electrode terminal plates are joined directly or via another member and an electrode terminal plate part is sealed. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、可撓性部材を外装材とした密閉型電池に関するものであり、確実な封口が実現可能な密閉型電池を提供することを課題とするものである。
【０００２】
【従来の技術】
リチウムイオン電池等の有機電解質を用いた電池には、外装材として金属製の電池缶を用いた密閉型電池と、合成樹脂製フィルムとアルミニウム箔等を積層した可撓性部材を外装材とした密閉型電池が知られている。
【０００３】
可撓性部材を外装材とした密閉型電池は、内側に熱融着性の部材を配した可撓性部材で発電要素を両側から挟み込んで周囲を加熱して熱融着することによって封口が行なわれる。熱融着性面の融着は、熱融着性面同士を接合することは比較的容易であり、しかも封口部から漏洩がない確実な接合部を形成することが可能である。
【０００４】
ところが、密閉型電池においては、発電要素に接合した導電接続用の電極端子板を取り出すことが不可欠であり、可撓性部材の接合面の一部から電極端子板を取り出し、電極端子板と可撓性部材との間、電極端子板の周囲の部分のそれぞれの可撓性部材を融着面して接合が行われている。
【０００５】
ところが、電極端子板と熱融着性フィルムとが接触する部分は、電極端子の厚みによって凹凸が生じるとともに、電極端子板を構成する金属材料と合成樹脂フィルムとの間に形成される異種物質間を接合することが必要である。このため、電極端子板と可撓性部材との接触面では接合強度が不充分なものとなり、電解液の漏洩等が生じる可能性もあった。
【０００６】
そこで、電極端子板の取り出し部での封口不良が生じないものとするために、電極端子板の取り出し部に熱融着に用いるヒートシーラーとして電極端子板によって形成される凹凸に合致した部材を用いて、凹凸部における封口不良を防止する等の封口特性を改善する各種の方法が提案されている（例えば、特許文献１）。
【０００７】
図７は、従来の密閉型電池の製造方法を説明する図である。
図７（Ａ）は、密閉型電池を説明する図であり、図７（Ｂ）は、製造工程を説明する断面図であり、図７（Ｃ）は図７（Ｂ）においてＡ−Ａ’線で切断した断面図である。
図７（Ａ）に示すように、密閉型電池１は、可撓性部材２を外装材として電池要素３が封口されており、電池要素３に結合された電極端子板４ａ，４ｂが、可撓性部材２の熱融着性が良好な面の接合面から取り出されており、密閉型電池１の周囲は、可撓性部材の面の相互が熱融着部８を形成して接合されている。
【０００８】
図７（Ｂ）に断面図を示し、図７（Ｃ）には図７（Ｂ）においてＡ−Ａ’線で切断した断面図を示すように、電池要素３に取り付けた電極端子板４ａ、４ｂのそれぞれに、可撓性部材との熱融着性が良好な熱接着性部材７を装着して、所定の温度の加熱したヒートシーラー９によって、両面から加圧して可撓性部材２ａ，２ｂと熱接着性部材７ａ，７ｂ、および電極端子板４ａ，４ｂを熱融着して一体化して封口される。
【０００９】
ヒートシーラー９として、電極端子板によって形成される凹凸部の形状に合致した断面形状を有したものを用いることによって、電極端子板４ａ，４ｂの上部とその他の部分を、熱融着工程において同時に熱融着して封口を行っている。
【００１０】
また、電極端子板が通過しない部分の可撓性部材の熱融着は、平板状のヒートシーラー（図示しない）を用いて可撓性部材の熱融着性を有する面の相互を接合して可撓性部材の熱融着部８が形成される。
【００１１】
しかしながら、電極端子板が存在する領域とその他の部分では、一方がアルミニウム等の金属材料と合成樹脂との接合面が形成されるのに対し、他方は熱融着性が良好な合成樹脂材料同士の接合面であって接合面の構成が相違し、また熱融着時に加えるべき、温度、圧力等の接合条件も金属が存在する部分と、そうではない部分では好適な値が異なる。したがって、このように２枚の可撓性部材の間に電極端子板を設けて両面から加熱して軟化させるとともに加圧して、電極端子板部を含めて熱融着する方法での接合では封口不良が生じると言う問題点があった。
【００１２】
【特許文献１】
特開２００１−２２９８９０号公報
【００１３】
【発明が解決しようとする課題】
本発明は、可撓性部材を外装材とした密閉型電池において、電極端子板の封口部、およびその他の可撓性部材の接合面からなる封口部での封口不良が生じることがない密閉型電池を提供することを課題とするものである。
【００１４】
【課題を解決するための手段】
本発明の課題は、可撓性部材を外装材とした密閉型電池において、電池要素に接続した電極端子板は、可撓性外装材に設けた貫通口を貫通し、可撓性部材は、電極端子板面に直接もしくは他の部材を介して接合されて封口された密閉型電池によって解決することができる。
【００１５】
このように、本発明の密閉型電池は、電極端子板は可撓性部材に設けた穴を貫通し、電極端子板と可撓性部材は、直接もしくは間接的に接触して熱融着によって一体化されて封口されており、電極端子板は、貫通口部において可撓性部材と融着して一体化されているので、確実な封口を行うことが可能となる。
【００１６】
また、本発明の密閉型電池は、電極端子板を可撓性部材から外部へ取り出す部分は、貫通口を貫き、その周囲は連続した部材で形成されている。
例えば、可撓性部材によって周囲を封口した直方体状の密閉型電池の場合には、周縁部に４個の稜あるいは辺が形成されるが、電極端子板が貫通する一つの稜と、可撓性部材同士の融着によって封口されている３つの稜または辺が存在する。電極端子板の存在する稜または辺は、電極端子板が貫通する近傍において、電極端子板の両面の可撓性部材を電極端子板と熱融着によって封口一体化するのみで良く、他の３個の稜または辺は可撓性部材同士の熱融着による接合となるので、電極端子板の封口と、可撓性部材同士の融着のそれぞれを最適条件での封口が実現できる。
【００１７】
また、本発明においては、電極端子板を取り出した稜あるいは辺を除く周縁部等の封口部は可撓性部材同士の熱融着等によって接合されて封口されているので、それらの封口部には、他の部材が存在したり、凹凸等がなく、同一の材料間での接合となるので、確実な封口が実現できる。
また、電極端子板上に熱接着性部材を配置して可撓性部材を融着して封口した前記の密閉型電池である。
【００１８】
金属製の電極端子板と可撓性外装材との間は、金属材料と合成樹脂との異種の材料間の接合面が形成されるので金属面との接合性が良好な熱接着性部材を配置することによって電極端子板と可撓性部材との間の封口特性を高めることが好ましい。
【００１９】
また、電極端子板が可撓性部材の周縁部の異なる稜または辺に設けた穴を貫通するとともに、該周縁部は貫通部を除き、表裏が連続した部材で形成されており、電極端子板面と可撓性部材の間が封口された密閉型電池である。
【００２０】
このように正極端子板と負極端子板とを互いに離れた位置から取り出すことによって、正極側の電極端子板と負極側の電極端子板との距離を設けて配置させることが可能となり、短絡等の可能性を減少させ、電池使用機器への装着の自由度を高めることができる。
【００２１】
【発明の実施の形態】
本発明の密閉型電池は、可撓性部材を外装材とした電池において、電極端子板を貫通口から取り出し、貫通口を封口したので、電極端子板の封口部と可撓性部材のその他の部分の熱融着部とをそれぞれの最も好ましい条件によって融着して、特性の優れた封口部を形成することが可能であることを見出したものである。
【００２２】
以下に、本発明の密閉型電池を図面を参照して説明する。
図１は、本発明の密閉型電池を説明する図であり、斜視図である。
本発明の密閉型電池１は、可撓性部材２を外装材として、電池要素３が封口されたものであり、可撓性部材２に形成された凹部１０に電池要素３が収納されて保持されている。
電池要素３に結合された電極端子板４ａ、４ｂが、可撓性部材２に設けた貫通口５ａ、５ｂを貫通するとともに、電極端子板４ａおよび４ｂが可撓性部材との間に熱融着部６ａ，６ｂを形成して封口されている。
【００２３】
熱融着部６ａ，６ｂは、アルミニウム、ニッケル、銅等の金属材料と可撓性部材の熱融着性を有する面との間で直接接合して形成することができるが、金属と合成樹脂材料との異種の材料の接合面であるので、金属表面には熱融着性が良好な熱接着性部材７ａおよび７ｂを配置して接合強度、封口特性を高めることが好ましい。そのような部材としては、ポリエチレン、ポリプロピレン等のポリオレフィンを、グラフト化したり、あるいは金属イオン等で架橋したもの、あるいはアクリル酸、メタクリル酸等の共重合体等を挙げることができる。
【００２４】
また、密閉型電池１の周縁部の可撓性部材に電極端子板４ａおよび４ｂを貫通させる貫通口を設けた稜、あるいは辺については、可撓性部材は貫通口を除いて連続した部材で形成されており、貫通口部において電極端子板との間での熱融着を行うのみで封口が達成できる。
また、その他の周縁部は、表裏の可撓性部材の熱融着性を有する面の相互の融着によって熱融着部８が形成されて封口される。
【００２５】
以上のように、電極端子板の金属と可撓性部材との熱融着部と、可撓性外装材同士の熱融着部とを、それぞれ別個に熱融着を行うことが可能となるので、それぞれの熱融着にとって最適の条件で接合部を形成することができ、封口特性が優れた密閉型電池を得ることができる。
【００２６】
図２は、本発明の密閉型電池の他の実施例を説明する図であり、図２（Ａ）は平面図、図２（Ｂ）は斜視図である。
図１に示した例では、可撓性部材に電池要素を収容可能な凹部を形成した例を示したが、図２に示した例では、可撓性部材に電池要素を収容可能な凹部を形成していない。
本発明の密閉型電池１は、可撓性部材２を外装材として、電池要素３が封口されたものであり、電池要素が収納されている。電池要素３に結合された電極端子板４ａ，４ｂが、可撓性部材２に設けた貫通口５ａ，５ｂを貫通するとともに、電極端子板４ａ，４ｂが可撓性部材との間に熱融着部６ａ，６ｂを形成して封口されている。
【００２７】
熱融着部６ａ，６ｂは、アルミニウム、ニッケル、銅等の金属材料と可撓性部材の熱融着性を有する面との間で直接接合して形成することができるが、金属と合成樹脂材料との異種の材料の接合面であるので、金属表面には熱融着性が良好な熱接着性部材７ａ，７ｂを配置して接合強度、封口特性を高めることが好ましい。
また、その他の周縁部は、表裏の可撓性部材の熱融着性を有する面の相互の融着によって熱融着部８が形成されて封口される。
【００２８】
また、密閉型電池１の周縁部の可撓性部材に電極端子板４ａ，４ｂを貫通させる貫通口を設けた稜、あるいは辺については、可撓性部材は貫通口を除いて連続した部材で形成されており、貫通口部において電極端子板との間での熱融着を行うのみで封口が達成できる。
【００２９】
更に、電池要素３は図１に示した例のように可撓性部材に凹部を設けて凹部に収納していないので、可撓性部材２および電池要素３のそれぞれの大きさ、配置状況等によっては、可撓性部材２の内部において電池要素３が移動し、電池要素に接続した電極端子板４ａ，４ｂに歪み等が加わるおそれがある。
【００３０】
そこで、凹部等の電池要素の収納部を形成していない場合には、電極端子板を取り出すために貫通口を設けた稜、あるいは辺にあって、電極端子板の封口部以外の領域に変形防止用熱融着部１４を設けることが好ましい。変形防止用熱融着部１４は、可撓性部材の端部が広がったり、あるいは電池要素が内部で移動することを防止する機能を有したものであれば、連続した熱融着部である必要はなく、間欠的に形成されたものであっても良い。
【００３１】
図３は、本発明の密閉型電池の製造工程を説明する図である。
図３（Ａ）に示すように、可撓性部材２に電池要素が収納される凹部１０をエンボス加工によって形成し、中央部には折り目１１を設けるとともに、電極端子板の貫通口５ａ，５ｂを形成する。
次いで、図３（Ｂ）に断面図を示し、図３（Ｃ）には図３（Ｂ）におけるＡ−Ａ’線の断面図を示すように、可撓性部材２の貫通口５ａ，５ｂに電池要素３の電極端子板４ａ，４ｂを貫通させ、可撓性部材２を折り目１１に沿って折り曲げた後に、電極端子板４ａ，４ｂの熱融着個所に装着した熱接着性部材７ａ，７ｂの上方に位置する可撓性部材２の両面からヒートシーラー９で加圧および加熱して可撓性部材２と電極端子板４ａ，４ｂとを熱融着する。
熱融着の結果、図３（Ｄ）に斜視図を示すように、電極端子板４ａ，４ｂは、可撓性部材２との間で熱融着部６ａ，６ｂを形成して封口が完了する。
【００３２】
次いで、図３（Ｅ）に示すように、可撓性部材の周縁部の電極端子板４ａ，４ｂを取り出した個所以外の辺のうち、一辺を残してヒートシーラーを両面から押圧して熱融着部８ａ，８ｂを形成する。
【００３３】
次いで、図３（Ｆ）に示すように、封口していない部分から電解液注液手段１２を用いて電解液を注液する。その後、図３（Ｇ）に示すように内部を減圧した状態で可撓性部材をヒートシーラーを用いて両面から押圧して熱融着部８ｃを形成して封口を完成する。
【００３４】
本発明の密閉型電池では電池要素に接合される電極端子板は、可撓性部材を折り曲げた部分に形成した貫通口に円滑に貫通が可能となるように予め整形をすることが好ましい。
【００３５】
また、正極側電極端子板、負極側電極端子板の両者を正極電極および負極電極の同一の方向の端部に設けて巻回することによって、電池要素の巻はじめ部、もしくは巻き終わり部のいずれか一方のみに電極端子板を設けることができる。これによって、正極側電極端子板、負極側電極端子板の両者を同一平面上に配置することが可能となるので、電極端子板の整形が不要となったり、わずかの整形のみで貫通口に貫通させることができる。また、電極端子板を直線状に取り出すことができるので、電池要素の端面において極性が異なる電極板と触れて短絡を生じる可能性を小さくすることができる。
【００３６】
図４は、本発明の電池の他の実施例を説明する図である。
図４（Ａ）は、斜視図であり、図４（Ｂ）は、図４（Ａ）におけるＢ−Ｂ’線での断面図である。
巻止めほぐれ防止テープ１３によって巻回体の巻きほぐれを防止した電池要素３に結合した電極端子板４ａ，４ｂには、電極端子を包囲する熱接着性部材７ａ，７ｂが電極端子板４ａ，４ｂの両側へ伸びた延長部７ｃ，７ｄを有している。その結果、電極端子板との熱融着による封口の際には、電極端子板によって形成される段差を小さくすることができる。
【００３７】
図５は、本発明の密閉型電池の他の実施例を説明する図である。
図５（Ａ）は、密閉型電池の外装材として使用する可撓性部材を説明する図である。
可撓性部材２には、電池要素の大きさと同等の距離を隔てて２個所に折り目１１ａ、１１ｂが形成され、その一方の折れ目に沿って電極端子板を貫通させる貫通口５ａ，５ｂが設けられている。
【００３８】
図５（Ｂ）に示すように、巻きほぐれ防止テープ１３で巻回体の巻きほぐれを防止した電池要素３の電極端子板４ａ，４ｂには、熱接着性部材７ａ，７ｂを装着し、図５（Ｃ）あるいは図５（Ｄ）に示すように、電極端子板４ａ，４ｂを可撓性部材の貫通口５ａ，５ｂに貫通させた後に、電極端子板と可撓性部材との間を熱融着によって封口し、次いで可撓性部材の両端部を電池要素の中央部付近において熱融着によって熱融着部８を形成した後に、いずれかの側面を熱融着し、次いで電解液の注液の後に残った側面を減圧しながら熱融着して封口を形成したものである。
【００３９】
図６は、本発明の電池の他の実施例を説明する図である。
図６（Ａ）は、密閉型電池の外装材として使用する可撓性部材を説明する図である。
可撓性部材２には、電池要素の大きさと同等の距離を隔てて２個所に折り目１１ａ、１１ｂが形成され、それぞれの折れ目１１ａ，１１ｂに沿って電極端子板を貫通させる貫通口５ａ，５ｂが設けられている。
図６（Ｂ）に示すように、巻きほぐれ防止テープ１３で巻回体の巻きほぐれを防止した電池要素３のそれぞれ反対側に取り出された電極端子板４ａ，４ｂには、熱接着性部材７ａ，７ｂが装着されている。
【００４０】
図６（Ｃ）あるいは図６（Ｄ）に示すように、電極端子板４ａ，４ｂを可撓性部材の貫通口５ａ，５ｂに貫通させた後に、電極端子板と可撓性部材との間を熱融着によって封口し、次いで可撓性部材の両端部を電池要素の中央部付近において熱融着によって熱融着部８を形成した後に、いずれかの側面を熱融着し、次いで電解液の注液の後に熱融着によって密閉型電池の封口を行われる。
【００４１】
【発明の効果】
本発明は、可撓性部材を外装材とした密閉型電池において、電池要素に結合した電極端子板を可撓性部材に形成した貫通口から取り出し、貫通口部において可撓性部材と融着して封口したものであり、電極端子板の封口部と可撓性外装材のその他の部分の熱融着部とをそれぞれの最も好ましい条件によって融着して、特性の優れた封口部を形成することができるので、封口特性が良好な密閉型電池を得ることができる。
【図面の簡単な説明】
【図１】図１は、本発明の密閉型電池を説明する図である。
【図２】図２は、本発明の密閉型電池の他の例を説明する図である。
【図３】図３は、本発明の密閉型電池の製造工程を説明する図である。
【図４】図４は、本発明の密閉型電池の他の実施例を説明する図である。
【図５】図５は、本発明の密閉型電池の他の実施例を説明する図である。
【図６】図６は、本発明の密閉型電池の他の実施例を説明する図である。
【図７】図７は、従来の密閉型電池の製造方法を説明する図である。
【符号の説明】
１…密閉型電池、２，２ａ，２ｂ…可撓性部材、３…電池要素、４ａ，４ｂ…電極端子板、５ａ，５ｂ…貫通口、６ａ，６ｂ…熱融着部、７ａ，７ｂ…熱接着性部材、７ｃ，７ｄ…延長部、８，８ａ，８ｂ，８ｃ…熱融着部、９…ヒートシーラー、１０…凹部、１１，１１ａ，１１ｂ…折り目、１２…電解液注液手段、１３…巻きほぐれ防止テープ、１４…変形防止用熱融着部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sealed battery using a flexible member as an exterior material, and an object of the present invention is to provide a sealed battery capable of realizing a secure sealing.
[0002]
[Prior art]
Batteries using an organic electrolyte such as a lithium-ion battery include a sealed battery using a metal battery can as a package, and a flexible member obtained by laminating a synthetic resin film and aluminum foil as a package. Sealed batteries are known.
[0003]
A sealed battery using a flexible member as an exterior material has a sealing structure in which a power generating element is sandwiched from both sides by a flexible member having a heat-fusible member disposed on the inside and the surroundings are heated and heat-sealed. Done. In the fusion of the heat-fusible surfaces, it is relatively easy to join the heat-fusible surfaces together, and it is possible to form a reliable joint without leakage from the sealing portion.
[0004]
However, in a sealed battery, it is indispensable to take out the electrode terminal plate for conductive connection joined to the power generating element, and take out the electrode terminal plate from a part of the joint surface of the flexible member, and connect it to the electrode terminal plate. Between the flexible members, the respective flexible members in the peripheral portion of the electrode terminal plate are fused and bonded.
[0005]
However, the portion where the electrode terminal plate and the heat-sealable film are in contact with each other has irregularities due to the thickness of the electrode terminal, and the foreign material formed between the metal material forming the electrode terminal plate and the synthetic resin film. It is necessary to join. For this reason, the joint strength at the contact surface between the electrode terminal plate and the flexible member is insufficient, and there is a possibility that leakage of the electrolyte or the like may occur.
[0006]
Therefore, in order to prevent poor sealing at the electrode terminal plate take-out portion, a member matching the irregularities formed by the electrode terminal plate is used as a heat sealer used for heat fusion at the electrode terminal plate take-out portion. Various methods have been proposed to improve the sealing characteristics such as preventing defective sealing in the uneven portion (for example, Patent Document 1).
[0007]
FIG. 7 is a diagram illustrating a conventional method of manufacturing a sealed battery.
7A is a diagram illustrating a sealed battery, FIG. 7B is a cross-sectional view illustrating a manufacturing process, and FIG. 7C is a cross-sectional view taken along a line AA ′ in FIG. It is sectional drawing cut | disconnected by the line.
As shown in FIG. 7A, in the sealed battery 1, the battery element 3 is sealed using the flexible member 2 as an exterior material, and the electrode terminal plates 4 a and 4 b connected to the battery element 3 are flexible. The flexible member 2 is taken out from the joint surface of the surface having good heat-fusibility, and the periphery of the sealed battery 1 is joined by forming the heat-fused portions 8 on the surfaces of the flexible members. ing.
[0008]
FIG. 7B shows a cross-sectional view, and FIG. 7C shows a cross-sectional view taken along the line AA ′ in FIG. 7B, as shown in FIG. 7B. 4b, a heat-adhesive member 7 having good heat-fusibility with the flexible member is attached, and the heat sealer 9 heated to a predetermined temperature presses both sides of the flexible member 2a. 2b, the heat-adhesive members 7a and 7b, and the electrode terminal plates 4a and 4b are heat-sealed and integrated and sealed.
[0009]
By using a heat sealer 9 having a cross-sectional shape that matches the shape of the concavo-convex portion formed by the electrode terminal plate, the upper portions of the electrode terminal plates 4a and 4b and other portions can be simultaneously bonded in the heat fusion step. Sealed by heat fusion.
[0010]
In addition, the heat-sealing of the flexible member in the portion where the electrode terminal plate does not pass is performed by joining the heat-fusible surfaces of the flexible member to each other using a flat heat sealer (not shown). The heat-sealed portion 8 of the flexible member is formed.
[0011]
However, in the region where the electrode terminal plate is present and in other portions, one is formed with a bonding surface between a metal material such as aluminum and the synthetic resin, while the other is formed between synthetic resin materials having good heat sealability. And the joining conditions, such as temperature and pressure, to be applied at the time of heat fusion are different between the portion where the metal exists and the portion where it does not. Therefore, the electrode terminal plate is provided between the two flexible members, and is heated and softened from both surfaces and pressurized, and the joint is formed by heat fusion including the electrode terminal plate portion. There is a problem that a defect occurs.
[0012]
[Patent Document 1]
JP 2001-229890 A
[Problems to be solved by the invention]
The present invention is directed to a sealed battery using a flexible member as an exterior material, in which a sealing failure does not occur in a sealing portion of an electrode terminal plate and a sealing portion formed of a joining surface of other flexible members. It is an object to provide a battery.
[0014]
[Means for Solving the Problems]
An object of the present invention is to provide a sealed battery using a flexible member as an exterior material, wherein the electrode terminal plate connected to the battery element passes through a through hole provided in the flexible exterior material, and the flexible member is The problem can be solved by a sealed battery which is joined to the electrode terminal plate surface directly or via another member and sealed.
[0015]
As described above, in the sealed battery of the present invention, the electrode terminal plate penetrates the hole provided in the flexible member, and the electrode terminal plate and the flexible member come into direct or indirect contact with each other by heat fusion. Since the electrode terminal plate is integrated with the flexible member at the through-hole portion by being fused and integrated, it is possible to perform reliable sealing.
[0016]
Further, in the sealed battery of the present invention, a portion for taking out the electrode terminal plate from the flexible member to the outside penetrates the through hole, and the periphery thereof is formed of a continuous member.
For example, in the case of a rectangular parallelepiped sealed battery whose periphery is sealed by a flexible member, four ridges or sides are formed at the peripheral edge, but one ridge through which the electrode terminal plate penetrates, and There are three ridges or sides sealed by fusing the sex members. The ridges or sides where the electrode terminal plate is present need only be integrated with the electrode terminal plate by heat sealing the flexible members on both sides of the electrode terminal plate near the electrode terminal plate penetrating. Since the individual ridges or sides are joined by thermal fusion between the flexible members, the sealing of the electrode terminal plate and the fusion of the flexible members can be achieved under optimal conditions.
[0017]
Further, in the present invention, since the sealing portions such as the peripheral portion excluding the ridges or sides from which the electrode terminal plates are taken out are joined and sealed by heat fusion between the flexible members, etc. Since there is no other member, no irregularities or the like, and the same material is joined, reliable sealing can be realized.
Further, in the above sealed battery, a thermoadhesive member is disposed on the electrode terminal plate, and a flexible member is fused and sealed.
[0018]
Between the metal electrode terminal plate and the flexible exterior material, a bonding surface between different materials of a metal material and a synthetic resin is formed. It is preferable to increase the sealing property between the electrode terminal plate and the flexible member by arranging them.
[0019]
In addition, the electrode terminal plate penetrates holes provided on different ridges or sides of the peripheral portion of the flexible member, and the peripheral portion is formed of a continuous front and back member except for the penetrating portion. This is a sealed battery in which the surface and the flexible member are sealed.
[0020]
By taking out the positive electrode terminal plate and the negative electrode terminal plate from positions distant from each other in this manner, it is possible to provide a distance between the positive electrode terminal plate and the negative electrode terminal plate, and it is possible to arrange a short circuit or the like. Possibility is reduced, and the degree of freedom of attachment to a battery-powered device can be increased.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
In the sealed battery according to the present invention, in the battery using the flexible member as the exterior material, the electrode terminal plate is taken out from the through-hole and the through-hole is sealed, so that the sealing portion of the electrode terminal plate and other parts of the flexible member are provided. It has been found that it is possible to form a sealed portion having excellent characteristics by fusing the heat-sealed portion of each portion under the most preferable conditions.
[0022]
Hereinafter, the sealed battery of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a sealed battery of the present invention, and is a perspective view.
In the sealed battery 1 of the present invention, the battery element 3 is sealed using the flexible member 2 as an exterior material, and the battery element 3 is housed and held in the concave portion 10 formed in the flexible member 2. Have been.
The electrode terminal plates 4a and 4b connected to the battery element 3 pass through the through holes 5a and 5b provided in the flexible member 2, and the electrode terminal plates 4a and 4b are thermally fused with the flexible member. The attachment portions 6a and 6b are formed and sealed.
[0023]
The heat-sealed portions 6a and 6b can be formed by directly bonding between a metal material such as aluminum, nickel, and copper and a surface of the flexible member having heat-sealing properties. Since it is a joining surface of a material different from the material, it is preferable to arrange the heat-adhesive members 7a and 7b having good heat-fusibility on the metal surface to enhance the joining strength and the sealing property. Examples of such a member include those obtained by grafting or cross-linking a polyolefin such as polyethylene or polypropylene with a metal ion or the like, or a copolymer such as acrylic acid or methacrylic acid.
[0024]
Further, with respect to the ridge or side in which a through-hole for penetrating the electrode terminal plates 4a and 4b is provided in the flexible member at the peripheral portion of the sealed battery 1, the flexible member is a continuous member excluding the through-hole. The sealing can be achieved only by performing thermal fusion between the through hole and the electrode terminal plate.
In addition, the other peripheral portion is sealed by forming a heat-welded portion 8 by mutual fusion of the heat-fusible surfaces of the front and back flexible members.
[0025]
As described above, it is possible to separately heat-bond a heat-sealed portion between the metal of the electrode terminal plate and the flexible member and a heat-sealed portion between the flexible exterior members. Therefore, the junction can be formed under the optimum conditions for each heat fusion, and a sealed battery having excellent sealing characteristics can be obtained.
[0026]
FIG. 2 is a view for explaining another embodiment of the sealed battery of the present invention. FIG. 2 (A) is a plan view and FIG. 2 (B) is a perspective view.
In the example shown in FIG. 1, an example is shown in which a concave portion capable of accommodating a battery element is formed in a flexible member. However, in the example shown in FIG. 2, a concave portion capable of accommodating a battery element is provided in a flexible member. Not formed.
The sealed battery 1 of the present invention is a battery in which the flexible member 2 is used as an exterior material and the battery element 3 is sealed, and the battery element is housed therein. Electrode terminal plates 4a, 4b connected to battery element 3 penetrate through holes 5a, 5b provided in flexible member 2, and electrode terminal plates 4a, 4b are thermally fused with the flexible member. The attachment portions 6a and 6b are formed and sealed.
[0027]
The heat-sealed portions 6a and 6b can be formed by directly bonding between a metal material such as aluminum, nickel, and copper and a surface of the flexible member having heat-sealing properties. Since it is a joining surface of a material different from the material, it is preferable to arrange the heat-adhesive members 7a and 7b having good heat-fusibility on the metal surface to enhance the joining strength and the sealing property.
In addition, the other peripheral portion is sealed by forming a heat-welded portion 8 by mutual fusion of the heat-fusible surfaces of the front and back flexible members.
[0028]
Further, with respect to a ridge or a side provided with a through-hole for penetrating the electrode terminal plates 4a and 4b in the flexible member at the peripheral portion of the sealed battery 1, the flexible member is a continuous member except for the through-hole. The sealing can be achieved only by performing thermal fusion between the through hole and the electrode terminal plate.
[0029]
Further, since the battery element 3 is not provided with a concave portion provided in the flexible member as in the example shown in FIG. 1, the size, arrangement, etc., of the flexible member 2 and the battery element 3 are different. In some cases, the battery element 3 may move inside the flexible member 2, and the electrode terminal plates 4a and 4b connected to the battery element may be strained or the like.
[0030]
Therefore, in the case where the storage portion for the battery element such as the concave portion is not formed, the electrode terminal plate is deformed to a region other than the sealing portion of the electrode terminal plate on a ridge or a side provided with a through hole for taking out the electrode terminal plate. It is preferable to provide a heat sealing portion 14 for prevention. The deformation-preventing heat-sealing portion 14 is a continuous heat-sealing portion as long as the end portion of the flexible member has a function of preventing the end portion from expanding or the battery element from moving inside. It is not necessary and may be formed intermittently.
[0031]
FIG. 3 is a diagram illustrating a manufacturing process of the sealed battery according to the present invention.
As shown in FIG. 3 (A), a concave portion 10 for accommodating the battery element is formed in the flexible member 2 by embossing, a fold 11 is provided in the center, and through holes 5a and 5b of the electrode terminal plate are provided. To form
Next, as shown in a cross-sectional view of FIG. 3B and a cross-sectional view taken along line AA ′ of FIG. 3B in FIG. 3C, the through-holes 5a and 5b of the flexible member 2 are shown. After the electrode terminal plates 4a and 4b of the battery element 3 penetrate and the flexible member 2 is bent along the fold 11, the heat-adhesive members 7a and 4a attached to the heat-sealed portions of the electrode terminal plates 4a and 4b The flexible member 2 and the electrode terminal plates 4a, 4b are heat-sealed by applying pressure and heat from both sides of the flexible member 2 located above 7b by the heat sealer 9.
As a result of the heat fusion, as shown in a perspective view in FIG. 3D, the electrode terminal plates 4a, 4b form heat fusion parts 6a, 6b with the flexible member 2 to complete the sealing. I do.
[0032]
Next, as shown in FIG. 3 (E), the heat sealer is pressed from both sides by pressing the heat sealer from both sides except for one of the sides other than where the electrode terminal plates 4a and 4b are taken out from the periphery of the flexible member. The attachment parts 8a and 8b are formed.
[0033]
Next, as shown in FIG. 3 (F), the electrolyte is injected from the unsealed portion using the electrolyte injection means 12. Thereafter, as shown in FIG. 3 (G), the flexible member is pressed from both sides using a heat sealer while the inside is decompressed to form a heat-sealed portion 8c to complete the sealing.
[0034]
In the sealed battery of the present invention, it is preferable that the electrode terminal plate to be joined to the battery element is preliminarily shaped so as to be able to smoothly pass through a through hole formed in a portion where the flexible member is bent.
[0035]
In addition, by providing both the positive electrode terminal plate and the negative electrode terminal plate at the ends of the positive electrode and the negative electrode in the same direction and winding them, either the beginning of the winding of the battery element or the end of the winding of the battery element An electrode terminal plate can be provided on only one of them. This makes it possible to arrange both the positive electrode terminal plate and the negative electrode terminal plate on the same plane, so that the electrode terminal plate does not need to be shaped, or penetrates the through hole with only a slight shaping. Can be done. Further, since the electrode terminal plate can be taken out in a straight line, it is possible to reduce the possibility of short-circuiting due to contact with an electrode plate having a different polarity on the end face of the battery element.
[0036]
FIG. 4 is a diagram illustrating another embodiment of the battery of the present invention.
FIG. 4A is a perspective view, and FIG. 4B is a cross-sectional view taken along line BB ′ in FIG. 4A.
On the electrode terminal plates 4a, 4b connected to the battery element 3 in which the wound body is prevented from being unraveled by the unwrapping and unraveling tape 13, thermoadhesive members 7a, 7b surrounding the electrode terminals are provided with the electrode terminal plates 4a, 4b. Have extensions 7c and 7d extending to both sides of the. As a result, the step formed by the electrode terminal plate can be reduced during sealing with the electrode terminal plate by thermal fusion.
[0037]
FIG. 5 is a view for explaining another embodiment of the sealed battery of the present invention.
FIG. 5A is a diagram illustrating a flexible member used as an exterior material of a sealed battery.
In the flexible member 2, folds 11a and 11b are formed at two places at a distance equivalent to the size of the battery element, and through holes 5a and 5b for penetrating the electrode terminal plate along one of the folds. Is provided.
[0038]
As shown in FIG. 5 (B), heat-adhesive members 7a and 7b are attached to the electrode terminal plates 4a and 4b of the battery element 3 in which the unwinding of the wound body is prevented by the unwinding prevention tape 13. As shown in FIG. 5 (C) or FIG. 5 (D), after the electrode terminal plates 4a, 4b are passed through the through holes 5a, 5b of the flexible member, the space between the electrode terminal plate and the flexible member is changed. After sealing by heat sealing, and then forming both ends of the flexible member near the center of the battery element by heat sealing, either side is heat-sealed, and then the electrolytic solution The sealing was formed by heat-sealing the side surface remaining after the liquid injection while reducing the pressure.
[0039]
FIG. 6 is a diagram illustrating another embodiment of the battery of the present invention.
FIG. 6A is a diagram illustrating a flexible member used as an exterior material of a sealed battery.
In the flexible member 2, folds 11a and 11b are formed at two places at a distance equivalent to the size of the battery element, and through-holes 5a and pierced through the electrode terminal plates along the folds 11a and 11b. 5b is provided.
As shown in FIG. 6 (B), the heat-adhesive members 7a are attached to the electrode terminal plates 4a and 4b taken out on the opposite sides of the battery element 3 whose winding body is prevented from being unraveled by the unraveling prevention tape 13. , 7b are mounted.
[0040]
As shown in FIG. 6 (C) or FIG. 6 (D), after the electrode terminal plates 4a, 4b are passed through the through-holes 5a, 5b of the flexible member, the gap between the electrode terminal plate and the flexible member is reduced. Is sealed by heat sealing, and then the both ends of the flexible member are heat-sealed near the center of the battery element to form a heat-sealed portion 8. After the liquid is injected, the sealed battery is sealed by heat fusion.
[0041]
【The invention's effect】
The present invention relates to a sealed battery using a flexible member as an exterior material, wherein an electrode terminal plate coupled to a battery element is taken out from a through hole formed in the flexible member, and fused with the flexible member at the through hole. The sealing portion of the electrode terminal plate and the heat-sealed portion of the other portion of the flexible exterior material are fused under the most preferable conditions to form a sealed portion having excellent characteristics. Therefore, a sealed battery having good sealing characteristics can be obtained.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a sealed battery of the present invention.
FIG. 2 is a diagram illustrating another example of the sealed battery of the present invention.
FIG. 3 is a diagram illustrating a manufacturing process of the sealed battery of the present invention.
FIG. 4 is a view for explaining another embodiment of the sealed battery of the present invention.
FIG. 5 is a view for explaining another embodiment of the sealed battery of the present invention.
FIG. 6 is a diagram illustrating another embodiment of the sealed battery of the present invention.
FIG. 7 is a diagram for explaining a conventional method of manufacturing a sealed battery.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Sealed battery, 2, 2a, 2b ... Flexible member, 3 ... Battery element, 4a, 4b ... Electrode terminal plate, 5a, 5b ... Through-hole, 6a, 6b ... Heat fusion part, 7a, 7b ... Thermoadhesive members, 7c, 7d: extension portions, 8, 8a, 8b, 8c: heat fusion portions, 9: heat sealers, 10: concave portions, 11, 11a, 11b: folds, 12: electrolyte injection means, 13: tape for preventing unraveling, 14: heat-sealing part for deformation prevention

Claims

In a sealed battery using a flexible member as an exterior material, an electrode terminal plate connected to a battery element penetrates a through hole provided in the flexible member, and the flexible member and the electrode terminal plate may be directly or otherly connected. Wherein the electrode terminal plate portion is sealed by being joined via the above member.