JPH11260343A - Polymer electrolyte battery - Google Patents
Polymer electrolyte batteryInfo
- Publication number
- JPH11260343A JPH11260343A JP10073243A JP7324398A JPH11260343A JP H11260343 A JPH11260343 A JP H11260343A JP 10073243 A JP10073243 A JP 10073243A JP 7324398 A JP7324398 A JP 7324398A JP H11260343 A JPH11260343 A JP H11260343A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- aluminum foil
- polymer electrolyte
- aluminum
- foil
- 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.)
- Granted
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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ポリマー電解質電
池に関し、さらに詳しくは、特に携帯用機器、電気自動
車、ロードレベリングなどに使用するのに適したポリマ
ー電解質電池に関する。The present invention relates to a polymer electrolyte battery, and more particularly, to a polymer electrolyte battery particularly suitable for use in portable equipment, electric vehicles, road leveling, and the like.
【０００２】[0002]
【従来の技術】シート状の電解質を用いることにより、
Ａ４版、Ｂ５版などの大面積でしかも薄形の電池の作製
が可能になり、各種薄形製品への適用が可能になって、
電池の使用範囲が大きく広がっている。特にポリマー電
解質を用いた電池は、耐漏液性を含めた安全性、貯蔵性
が優れており、しかも薄く、フレキシブルなため、機器
の形状に合わせた電池を設計できるという、今までの電
池にない特徴を持っている。2. Description of the Related Art By using a sheet-like electrolyte,
It is possible to manufacture large-area and thin batteries such as A4 and B5 plates and apply them to various thin products.
The range of use of batteries is greatly expanding. In particular, batteries using polymer electrolytes have excellent safety and storage properties, including liquid leakage resistance, and are thin and flexible, making it possible to design batteries that match the shape of equipment. Has features.
【０００３】このポリマー電解質電池は、通常、アルミ
ニウムフィルムを芯材にしたラミネートフィルムを外装
体に用い、薄いシート状の電極とシート状のポリマー電
解質層とを組み合わせて、薄形電池に仕上げられる。[0003] This polymer electrolyte battery is usually finished into a thin battery by using a laminate film having an aluminum film as a core material for an outer package and combining a thin sheet-like electrode and a sheet-like polymer electrolyte layer.
【０００４】[0004]
【発明が解決しようとする課題】このポリマー電解質電
池では、電極に薄形にするため金属箔を集電体に用いて
いて、正極の集電体にはアルミニウム箔を用い、負極の
集電体には銅箔を用いている。そして、電池の外部端
子、つまり、正極端子や負極端子としては、使用機器と
の接続の都合上、通常、ニッケルの箔またはリボンが用
いられている。In this polymer electrolyte battery, a metal foil is used as a current collector to make the electrode thinner, an aluminum foil is used as a positive electrode current collector, and a negative electrode current collector is used. Is made of copper foil. As the external terminals of the battery, that is, the positive electrode terminal and the negative electrode terminal, nickel foil or ribbon is usually used for the sake of connection with the equipment to be used.
【０００５】これら電極と外部端子との電気的接続は、
通常、正極作製時にアルミニウム箔の一部に正極合剤層
を形成せずにアルミニウム箔の露出部を残し、そこを外
部端子としての正極端子との接続部分にするか、または
上記アルミニウム箔の露出部にアルミニウム製のリード
体を超音波溶接などで接続し、そのアルミニウム製のリ
ード体の自由端側を外部端子としての正極端子との接続
部分にし、負極側では負極作製時に銅箔の一部に負極合
剤層を形成せずに銅箔の露出部を残し、そこを外部端子
としての負極端子との接続部分にするか、または上記銅
箔の露出部に接続した銅製のリード体の自由端側を外部
端子としての負極端子との接続部分にしている。The electrical connection between these electrodes and external terminals is
Normally, the positive electrode mixture layer is not formed on a part of the aluminum foil at the time of manufacturing the positive electrode, and the exposed portion of the aluminum foil is left, and this is used as a connection portion with the positive electrode terminal as an external terminal, or the aluminum foil is exposed. The aluminum lead body is connected to the part by ultrasonic welding, etc., and the free end side of the aluminum lead body is used as the connection part with the positive terminal as an external terminal. Leave the exposed portion of the copper foil without forming the negative electrode mixture layer on it and use it as a connection part with the negative electrode terminal as an external terminal, or free of the copper lead body connected to the exposed portion of the copper foil The end side is a connection portion with a negative electrode terminal as an external terminal.
【０００６】しかし、正極側におけるアルミニウムとニ
ッケルとの溶接は、非常に難しく、通常、抵抗溶接、超
音波溶接などで溶接が行われているが、強度が低く、し
かもニッケルとアルミニウムとではその間に電解液が介
在するとアルミニウムの腐食が生じるという問題があっ
た。However, it is very difficult to weld aluminum and nickel on the positive electrode side. Usually, welding is performed by resistance welding, ultrasonic welding, or the like. There has been a problem that the presence of the electrolytic solution causes corrosion of aluminum.
【０００７】従って、本発明は、上記のような従来技術
の問題点を解決し、アルミニウム箔などと外部端子とし
ての正極端子との接続強度の低下や腐食に基づく電池特
性の低下を抑制し、信頼性の高いポリマー電解質電池を
提供することを目的とする。Accordingly, the present invention solves the above-mentioned problems of the prior art, and suppresses a decrease in connection strength between aluminum foil or the like and a positive electrode terminal as an external terminal and a decrease in battery characteristics due to corrosion. An object is to provide a highly reliable polymer electrolyte battery.
【０００８】[0008]
【課題を解決するための手段】本発明は、正極のアルミ
ニウム箔または該アルミニウム箔に接続したアルミニウ
ム製のリード体と正極端子との接続を外装体のシール部
分で行うことにより、上記課題を解決したものである。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems by connecting the aluminum foil of the positive electrode or the aluminum lead connected to the aluminum foil to the positive electrode terminal at the sealing portion of the exterior body. It was done.
【０００９】すなわち、上記の構成にすることにより、
アルミニウム箔または該アルミニウム箔に接続したアル
ミニウム製のリード体と正極端子との接続部分は外装体
のシール部分で押さえられるようになるので、それらの
接続強度は補強され、また正極端子にニッケル系のもの
を用いていても、その接続部分が外装体のシール部分内
にあるので、電解液が上記接続部分に接触することがな
く、従って、アルミニウムの腐食が生じない。That is, with the above configuration,
The connection portion between the aluminum foil or the aluminum lead connected to the aluminum foil and the positive electrode terminal is pressed by the sealing portion of the exterior body, so that their connection strength is reinforced, and the positive electrode terminal has a nickel-based material. Even if a material is used, since the connecting portion is in the sealing portion of the exterior body, the electrolytic solution does not come into contact with the connecting portion, and therefore, corrosion of aluminum does not occur.
【００１０】[0010]
【発明の実施の形態】本発明において、正極の集電体と
して用いるアルミニウム箔は、正極の厚みを薄くする関
係上、厚みが２０μｍ以下のものが好ましく、本発明で
は、そのように薄いものであっても、その露出部が外装
体のシール部分より外部に出ないので、破損するおそれ
が少ない。ただし、あまりにも薄すぎると、正極の作製
にあたって、正極合剤ペーストを塗布した際に皺が発生
したり、引っ張りにより破れが生じるおそれがあるの
で、その厚みは上記のように２０μｍ以下で１０μｍ以
上が好ましい。なお、負極の集電体として用いる銅箔
は、厚みが５〜２０μｍのものが好ましい。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the aluminum foil used as the current collector of the positive electrode is preferably 20 μm or less in terms of reducing the thickness of the positive electrode. Even if there is, the exposed portion does not protrude outside the sealing portion of the exterior body, so that there is little possibility of breakage. However, if the thickness is too small, in the preparation of the positive electrode, wrinkles may occur when the positive electrode mixture paste is applied, or the film may be broken by pulling. Is preferred. The copper foil used as the current collector of the negative electrode preferably has a thickness of 5 to 20 μm.
【００１１】外部端子としての正極端子には、使用機器
との接続の容易さなどの関係から、ニッケルまたはニッ
ケルメッキをした鉄、銅、ステンレス鋼などの金属の箔
やリボンなどが好ましく、その厚みは５０〜２００μｍ
が好ましい。すなわち、それらの厚みを５０μｍ以上に
することによって、正極端子の溶接時の切断の防止、引
っ張り、折り曲げによる断裂の防止を図ることができ、
また、厚みを２００μｍ以下にすることによって、シー
ル部分に隙間が生じたり、電池の総厚が厚くなりすぎて
薄形電池としての特徴を失なうのを防止することができ
る。The positive electrode terminal as the external terminal is preferably a metal foil or ribbon of nickel, nickel-plated iron, copper, stainless steel, or the like from the viewpoint of ease of connection with equipment to be used. Is 50-200 μm
Is preferred. That is, by setting the thickness to 50 μm or more, it is possible to prevent cutting during welding of the positive electrode terminal, pull, and prevent tearing due to bending,
Further, by setting the thickness to 200 μm or less, it is possible to prevent a gap from being generated in a seal portion, or to prevent the total thickness of the battery from becoming too thick and losing the characteristics as a thin battery.
【００１２】また、アルミニウム製のリード体を用いて
正極端子と接続する場合は、このアルミニウム製のリー
ド体の厚さは、上記正極端子の場合と同様に、５０〜２
００μｍが好ましい。このようなリード体は、特に正極
のアルミニウム箔が薄く、強度面で直接外部端子として
の正極端子と接続するのに好ましくない場合に、用いる
ことが好ましい。When connecting to the positive electrode terminal using an aluminum lead, the thickness of the aluminum lead is 50 to 2 as in the case of the positive electrode.
00 μm is preferred. Such a lead body is preferably used when the aluminum foil of the positive electrode is particularly thin and it is not preferable in terms of strength to directly connect to the positive electrode terminal as an external terminal.
【００１３】上記アルミニウム箔または該アルミニウム
箔に接続したアルミニウム製のリード体と正極端子との
接続方法としては、たとえば、抵抗溶接、超音波溶接、
レーザー溶接、ハンダ、カシメ、導電性接着剤による方
法など、各種の方法を採用することができるが、特に溶
接が適している。The connection method between the aluminum foil or the aluminum lead connected to the aluminum foil and the positive electrode terminal includes, for example, resistance welding, ultrasonic welding,
Various methods such as laser welding, soldering, caulking, and a method using a conductive adhesive can be employed, but welding is particularly suitable.
【００１４】外装体としては、たとえば、ポリエステル
フィルム−アルミニウムフィルム−変性ポリオレフィン
フィルムからなる三層構造のラミネートフィルムなどが
用いられ、そのシール部分の幅は、広いほど強度面から
は有利であるが、外装体のシール部分の幅を広くする
と、外装体が大きくなり、電池の体積や重量が増加し
て、小型化への妨げとなり、また、外装体の大きさを変
えずにシール部分の幅を広くすると、それにあわせて電
極を小さくしなければならず、高容量化への妨げとなる
ので、シール部分の幅は溶接などの接続部分の中心から
両側にそれぞれ１ｍｍ以上で５ｍｍ程度までにするのが
好ましい。As the outer package, for example, a laminated film having a three-layer structure composed of a polyester film, an aluminum film, and a modified polyolefin film is used. The wider the sealing portion, the more advantageous from the viewpoint of strength. Increasing the width of the sealing portion of the outer body increases the size of the outer body, increasing the volume and weight of the battery, hindering miniaturization, and reducing the width of the sealing portion without changing the size of the outer body. If the width is widened, the electrode must be reduced accordingly, which hinders the increase in capacity. Therefore, the width of the seal portion should be 1 mm or more and about 5 mm on both sides from the center of the connection portion such as welding. Is preferred.
【００１５】本発明においては、正極の集電体であるア
ルミニウム箔と外部端子としての正極端子との接続に関
する問題点を解決するための手段を提供することを目的
としていて、負極の集電体である銅箔と外部端子として
の負極端子との接続に関して特に言及していないが、こ
れは銅箔と負極端子との接続には正極側におけるような
溶接強度や腐食面での問題が生じないからである。ただ
し、負極の銅箔と負極端子との接続に関して、正極のア
ルミニウム箔または該アルミニウム箔に接続したアルミ
ニウム製のリード体と正極端子との接続に関する場合と
同様の手段を採用してもよいことはもちろんである。An object of the present invention is to provide a means for solving the problem of connection between an aluminum foil as a current collector of a positive electrode and a positive electrode terminal as an external terminal. No particular mention is made of the connection between the copper foil and the negative terminal as an external terminal, but this does not cause a problem in terms of welding strength or corrosion as in the case of the positive electrode in the connection between the copper foil and the negative terminal. Because. However, regarding the connection between the copper foil of the negative electrode and the negative electrode terminal, the same means as in the case of the connection between the aluminum foil of the positive electrode or the aluminum lead connected to the aluminum foil and the positive electrode terminal may be employed. Of course.
【００１６】[0016]
【実施例】つぎに、実施例を挙げて本発明をより具体的
に説明する。ただし、本発明はそれらの実施例のみに限
定されるものではない。なお、以下においては、正極の
集電体としてのアルミニウム箔と正極端子との溶接位置
を変えて実施例および比較例を説明していくが、それら
の説明に先立って正極、負極およびポリマー電解質層の
作製について説明する。Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to only these examples. In the following, Examples and Comparative Examples will be described by changing the welding position between the aluminum foil as the current collector of the positive electrode and the positive electrode terminal, but prior to the description, the positive electrode, the negative electrode, and the polymer electrolyte layer will be described. Will be described.
【００１７】正極の作製：正極活物質であるＬｉＣｏＯ
2 ５０重量部、電導助剤であるアセチレンブラック１０
重量部、バインダであるポリフッ化ビニリデン１０重量
部を均一になるように混合し、さらに電解液４０重量部
を加えて混合し、ペースト状の正極合剤を調製した。上
記電解液はプロピレンカーボネートとエチレンカーボネ
ートとの体積比１：１の混合溶媒にＬｉＰＦ6 を１．２
２モル／リットル溶解させたものである。そして、上記
のように調製したペースト状の正極合剤を集電体となる
厚さ２０μｍのアルミニウム箔の一方の面に塗布し、加
熱してゲル化させることによりアルミニウム箔上にゲル
状の正極合剤層を形成して、シート状の正極を作製し
た。ただし、上記正極の作製にあたっては、アルミニウ
ム箔の一部にペースト状の正極合剤を塗布せずにアルミ
ニウム箔の露出部を残し、その露出部を外部端子として
の正極端子との接続部分とした。Preparation of positive electrode: LiCoO as positive electrode active material
2 50 parts by weight, acetylene black 10 is a conductive aid
Parts by weight and 10 parts by weight of polyvinylidene fluoride as a binder were uniformly mixed, and further added and mixed with 40 parts by weight of an electrolytic solution to prepare a paste-like positive electrode mixture. The electrolytic solution was prepared by adding LiPF 6 to a mixed solvent of propylene carbonate and ethylene carbonate at a volume ratio of 1: 1 with 1.2.
2 mol / liter dissolved. Then, the paste-like positive electrode mixture prepared as described above is applied to one surface of a 20 μm-thick aluminum foil serving as a current collector, and heated to gel to form a gel-like positive electrode on the aluminum foil. The mixture layer was formed to produce a sheet-shaped positive electrode. However, in producing the positive electrode, the exposed portion of the aluminum foil was left without applying a paste-like positive electrode mixture to a part of the aluminum foil, and the exposed portion was used as a connection portion with a positive electrode terminal as an external terminal. .
【００１８】負極の作製：負極活物質である黒鉛４０重
量部とポリフッ化ビニリデン５重量部と上記正極に用い
たものと同様の電解液５５重量部を混合して、ペースト
状の負極合剤を調製し、このペースト状の負極合剤を集
電体となる銅箔の一方の面に塗布し、加熱してゲル化さ
せることにより銅箔上にゲル状の負極合剤層を形成し
て、シート状の負極を作製した。ただし、上記負極の作
製にあたっても、銅箔の一部にペースト状の負極合剤を
塗布せずに、銅箔の露出部を残し、その露出部を外部端
子として負極端子との接続部分とした。Preparation of negative electrode: 40 parts by weight of graphite as the negative electrode active material, 5 parts by weight of polyvinylidene fluoride, and 55 parts by weight of the same electrolytic solution as used for the positive electrode were mixed, and a paste-like negative electrode mixture was prepared. Prepare and apply this paste-like negative electrode mixture to one surface of a copper foil to be a current collector, and form a gel-like negative electrode mixture layer on the copper foil by heating and gelling, A sheet-shaped negative electrode was produced. However, also in the preparation of the negative electrode, without applying a paste-like negative electrode mixture to a part of the copper foil, leaving an exposed portion of the copper foil, the exposed portion was used as a connection portion with the negative electrode terminal as an external terminal. .
【００１９】ポリマー電解質層の作製：厚さ７０μｍの
ポリオレフィン不織布を支持体とし、この不織布に３種
類のアクリル系モノマー混合物１５重量部とその重合開
始剤である過酸化ベンゾイル０．７５重量部と前記同様
の電解液８５重量部とを混合した溶液を含浸させ、加熱
してモノマーを重合させるとともに全体をゲル化して、
シート状のゲル状ポリマー電解質層を作製した。上記ア
クリル系モノマー混合物は２−エトキシエチルアクリレ
ートとトリエチレングリコールジメタクリレートとエチ
レングリコールエチルカーボネートメタクリレートとを
重量比５０：１３：３３の割合で混合したものである。Preparation of polymer electrolyte layer: A polyolefin non-woven fabric having a thickness of 70 μm was used as a support, and the non-woven fabric was mixed with 15 parts by weight of a mixture of three acrylic monomers and 0.75 parts by weight of benzoyl peroxide as a polymerization initiator. Impregnated with a mixed solution of the same electrolyte solution 85 parts by weight, heated to polymerize the monomer and gelled the whole,
A sheet-like gel polymer electrolyte layer was prepared. The acrylic monomer mixture is a mixture of 2-ethoxyethyl acrylate, triethylene glycol dimethacrylate, and ethylene glycol ethyl carbonate methacrylate at a weight ratio of 50:13:33.
【００２０】このポリマー電解質層を上記正極と負極と
の間に配置し、圧着してユニットセルを構成し、該ユニ
ットセルを外装する外装体としてポリエステルフィルム
−アルミニウムフィルム−変性ポリオレフィンフィルム
からなる三層構造のラミネートフィルムを準備した。This polymer electrolyte layer is disposed between the above-mentioned positive electrode and negative electrode, and pressed to form a unit cell, and a three-layer consisting of a polyester film-aluminum film-modified polyolefin film is provided as a package for covering the unit cell. A laminated film having a structure was prepared.
【００２１】実施例１ 正極端子、負極端子とも厚さ１００μｍのニッケルリボ
ンを用い、上記ユニットセルを外装体で外装する際に該
外装体のシール部分になる位置で、正極のアルミニウム
箔と上記ニッケルリボンからなる正極端子とを超音波溶
接機を用い、溶接時間７５ｍｓｅｃ、圧力２ｋｇ／ｃｍ
2 、アンプリチュード６０％の条件下で超音波溶接し、
かつ負極の銅箔と上記ニッケルリボンからなる負極端子
とを溶接時間１２０ｍｓｅｃ、圧力２ｋｇ／ｃｍ2 、ア
ンプリチュード６０％の条件下で超音波溶接し、その
後、外装体でユニットセルを外装してポリマー電解質電
池を作製した。Example 1 A nickel ribbon having a thickness of 100 μm was used for both the positive electrode terminal and the negative electrode terminal, and the aluminum foil of the positive electrode and the nickel The positive electrode terminal made of ribbon is welded with an ultrasonic welding machine at a welding time of 75 msec and a pressure of 2 kg / cm.
2 , ultrasonic welding under the condition of amplitude 60%,
In addition, the copper foil of the negative electrode and the negative electrode terminal made of the above nickel ribbon are ultrasonically welded under the conditions of a welding time of 120 msec, a pressure of 2 kg / cm 2 , and an amplitude of 60%. An electrolyte battery was manufactured.
【００２２】アルミニウム箔と正極端子との溶接幅は２
ｍｍであり、また外装体のシール部分の幅は４ｍｍであ
った。The welding width between the aluminum foil and the positive electrode terminal is 2
mm, and the width of the sealing portion of the exterior body was 4 mm.
【００２３】上記電池の概略構造を図１を参照しつつ説
明すると、シート状の正極１とシート状の負極２との間
にシート状のポリマー電解質層３が配置してユニットセ
ルが構成され、そのユニットセルをラミネートフィルム
からなる外装体４で外装している。正極端子５や負極端
子６はこの電池における外部端子であり、この正極端子
５と正極１の集電体であるアルミニウム箔との溶接によ
る接続は外装体４のシール部分で行われている。The schematic structure of the battery will be described with reference to FIG. 1. A unit cell is constituted by disposing a sheet-like polymer electrolyte layer 3 between a sheet-like positive electrode 1 and a sheet-like negative electrode 2. The unit cell is packaged with a package 4 made of a laminate film. The positive electrode terminal 5 and the negative electrode terminal 6 are external terminals of the battery, and the connection of the positive electrode terminal 5 and the aluminum foil as the current collector of the positive electrode 1 by welding is performed at a sealed portion of the exterior body 4.
【００２４】図２は上記電池の正極１の集電体であるア
ルミニウム箔１ａと正極端子５との溶接による接続部分
およびその近傍を示すもので、この溶接による接続は外
装体４のシール部分４ａで行われている。すなわち、外
装体４は２枚用いられていて、そのシールは外装体４と
して用いられているラミネートフィルムの変性ポリオレ
フィンシートの熱融着によって行われるが、正極１のア
ルミニウム箔１ａと正極端子５との溶接による接続は上
記外装体４のシール部分４ａで行われ、そのアルミニウ
ム箔１ａと正極端子５との接続部分７は外装体４のシー
ル部分４ａの領域内に位置している。そして、その溶接
幅は前記のように２ｍｍで、シール部分４ａの幅は４ｍ
ｍである。なお、正極１は集電体となるアルミニウム箔
１ａの一方の面にゲル状の正極合剤層１ｂを形成してな
り、また、負極２は集電体となる銅箔２ａの一方の面に
ゲル状の負極合剤層２ｂを形成してなり、この実施例１
では、負極２の集電体である銅箔２ａと負極端子６との
溶接による接続も正極側の場合同様に外装体４のシール
部分で行われていて、その溶接幅は２ｍｍであるが、こ
の銅箔２ａと負極端子６との溶接はシール部分で行う必
要はなく、シール部分より内部側で行ってもよい。な
お、図１や図２は模式的に図示したものであり、各構成
部分の寸法比は必ずしも正確ではない。FIG. 2 shows a welded portion of the aluminum foil 1a, which is a current collector of the positive electrode 1 of the battery, and the vicinity of the positive electrode terminal 5, and the vicinity thereof. It is done in. That is, two exterior bodies 4 are used, and the sealing is performed by heat-sealing the modified polyolefin sheet of the laminated film used as the exterior body 4, but the aluminum foil 1a of the positive electrode 1 and the positive electrode terminal 5 Is made at the sealing portion 4a of the exterior body 4, and the connection portion 7 between the aluminum foil 1a and the positive electrode terminal 5 is located in the region of the sealing portion 4a of the exterior body 4. The welding width is 2 mm as described above, and the width of the sealing portion 4a is 4 m.
m. The positive electrode 1 is formed by forming a gel-like positive electrode mixture layer 1b on one surface of an aluminum foil 1a serving as a current collector, and the negative electrode 2 is provided on one surface of a copper foil 2a serving as a current collector. A gel negative electrode mixture layer 2b was formed.
In the above, the connection between the copper foil 2a, which is the current collector of the negative electrode 2, and the negative electrode terminal 6 by welding is also performed at the sealing portion of the exterior body 4 similarly to the case of the positive electrode side, and the welding width is 2 mm. The welding of the copper foil 2a and the negative electrode terminal 6 does not need to be performed at the sealed portion, but may be performed on the inner side of the sealed portion. 1 and 2 are schematic diagrams, and the dimensional ratio of each component is not always accurate.
【００２５】実施例２ 正極のアルミニウム箔の端部に厚さ１００μｍのアルミ
ニウム製リード体の一端を超音波溶接し、そのアルミニ
ウム製リード体の自由端側を正極端子と超音波溶接した
以外は、実施例１と同様にポリマー電解質電池を作製し
た。この電池の正極のアルミニウム製リード体と正極端
子との溶接による接続は、もちろん、外装体のシール部
分で行われている。また、溶接条件なども実施例１の場
合と同様である。Example 2 One end of an aluminum lead having a thickness of 100 μm was ultrasonically welded to an end of an aluminum foil of a positive electrode, and the free end of the aluminum lead was ultrasonically welded to a positive electrode terminal. A polymer electrolyte battery was manufactured in the same manner as in Example 1. The connection between the aluminum lead body of the positive electrode of the battery and the positive electrode terminal by welding is, of course, performed at the sealing portion of the exterior body. Further, welding conditions and the like are the same as those in the first embodiment.
【００２６】比較例１ 正極のアルミニウム箔とニッケルリボンからなる正極端
子との溶接および負極の銅箔とニッケルリボンからなる
負極端子との溶接による接続を外装体のシール部分より
電池内部側で行った以外は、実施例１と同様にポリマー
電解質電池を作製した。COMPARATIVE EXAMPLE 1 Welding of the positive electrode aluminum foil and the positive electrode terminal made of nickel ribbon and connection of the negative electrode copper foil and the negative electrode terminal made of nickel ribbon by welding were performed inside the battery from the sealed portion of the outer package. Except for the above, a polymer electrolyte battery was produced in the same manner as in Example 1.
【００２７】比較例２ 正極のアルミニウム箔とニッケルリボンからなる正極端
子との溶接による接続を外装体のシール部分により電池
外部側で行い、かつ負極の銅箔とニッケルリボンからな
る負極端子との溶接による接続を外装体のシール部分よ
り電池内部側で行った以外は、実施例１と同様にポリマ
ー電解質電池を作製した。Comparative Example 2 The connection by welding between the aluminum foil of the positive electrode and the positive electrode terminal made of nickel ribbon was made outside the battery by the sealing portion of the outer package, and the welding of the copper foil of the negative electrode and the negative electrode terminal made of nickel ribbon was performed. A polymer electrolyte battery was produced in the same manner as in Example 1, except that the connection was performed inside the battery from the sealed portion of the outer package.
【００２８】上記実施例１〜２および比較例１〜２の電
池の落下テストによる正極のアルミニウム箔と正極端子
との接続部分（溶接部分）の剥離の有無および６０℃、
相対湿度９０％の雰囲気中で２０日間貯蔵後の溶接部分
の腐食の有無を調べた。その結果を表１に示す。上記落
下テストは電池を１８０ｃｍの高さからコンクリート上
に落下させてアルミニウム箔またはアルミニウム製リー
ド体とニッケルリボンからなる正極端子との溶接部分の
剥離の有無を調べ、腐食の有無は実施例１〜２の電池と
比較例１の電池を分解して調べた。上記落下テストはい
ずれの電池も１０個ずつについて行い、表１にはテスト
に供した電池個数を分母に表記し、溶接部分の剥離を生
じた電池個数を分子に表記する態様で示す。In the drop test of the batteries of Examples 1 and 2 and Comparative Examples 1 and 2, the presence or absence of peeling of the connection portion (welded portion) between the aluminum foil of the positive electrode and the positive electrode terminal was determined.
After storage for 20 days in an atmosphere at a relative humidity of 90%, the welded portion was examined for corrosion. Table 1 shows the results. In the drop test, the battery was dropped on concrete from a height of 180 cm, and the presence or absence of peeling of the welded portion between the aluminum foil or aluminum lead body and the positive electrode terminal made of a nickel ribbon was checked. The battery of Comparative Example 1 and the battery of Comparative Example 1 were disassembled and examined. The drop test was performed for each of the ten batteries, and Table 1 shows the number of batteries subjected to the test in a denominator, and the number of batteries that caused peeling of a welded portion in a numerator.
【００２９】なお、負極の銅箔と負極端子との接続部分
（溶接部分）の剥離や負極側の銅の腐食について特にテ
ストをしていないのは、銅箔と負極端子との接続に関し
ては問題が生じないからである。It should be noted that the test for peeling of the connection portion (welded portion) between the copper foil of the negative electrode and the negative electrode terminal and the corrosion of copper on the negative electrode side are not particularly problematic for the connection between the copper foil and the negative electrode terminal. Is not generated.
【００３０】[0030]
【表１】 [Table 1]
【００３１】表１に示す結果から明らかなように、実施
例１〜２は、落下テストでの接続部分（溶接部分）の剥
離がなく、正極のアルミニウム箔またはアルミニウム製
リード体とニッケルリボンからなる正極端子とが充分な
接続強度（溶接強度）を有しており、かつ溶接部分のア
ルミニウムの腐食もなかった。As is evident from the results shown in Table 1, in Examples 1 and 2, there was no peeling of the connection portion (welded portion) in the drop test, and the aluminum foil or aluminum lead body of the positive electrode and the nickel ribbon were used. The positive electrode terminal had sufficient connection strength (weld strength), and there was no corrosion of aluminum at the welded portion.
【００３２】なお、上記実施例では、１個のユニットセ
ルを外装して電池に仕上げた場合を示したが、それに代
えて複数個のユニットセルを積層したユニットセル積層
体を外装して電池に仕上げてもよい。In the above embodiment, a case was shown in which one unit cell was packaged to finish the battery, but instead, a unit cell laminate in which a plurality of unit cells were laminated was packaged to form the battery. May be finished.
【００３３】なお、ポリマー電解質のゲル化に際して
は、上記実施例で示した以外に、たとえば、ラジカル重
合型の不飽和ポリエステル、または、ラジカル重合型の
アクリル系エポキシアクリレート、ウレタンアクリレー
ト、ポリエステルアクリレート、アルキッドアクリレー
ト、シリコンアクリレートなどの光硬化性樹脂を紫外線
あるいは電子線を用いてゲル化させるものであってもよ
い。When the polymer electrolyte is gelled, in addition to the examples described above, for example, radical polymerizable unsaturated polyester or radical polymerizable acrylic epoxy acrylate, urethane acrylate, polyester acrylate, alkyd A photocurable resin such as acrylate or silicon acrylate may be gelled using ultraviolet light or an electron beam.
【００３４】[0034]
【発明の効果】以上説明したように、本発明では、正極
のアルミニウム箔または該アルミニウム箔に接続したア
ルミニウム製のリード体と正極端子との接続強度を高
め、かつ溶接部分のアルミニウムの腐食を防止し、信頼
性の高いポリマー電解質電池を提供することができた。As described above, according to the present invention, the connection strength between the aluminum foil of the positive electrode or the aluminum lead connected to the aluminum foil and the positive electrode terminal is increased, and the corrosion of aluminum in the welded portion is prevented. Thus, a highly reliable polymer electrolyte battery could be provided.
【図１】本発明に係るポリマー電解質電池の一例を模式
的に示す断面図である。FIG. 1 is a cross-sectional view schematically showing one example of a polymer electrolyte battery according to the present invention.
【図２】図１に示す電池の正極のアルミニウム箔と外部
端子である正極端子との接続部分およびその近傍を模式
的に示す断面図である。FIG. 2 is a cross-sectional view schematically showing a connection portion between an aluminum foil of a positive electrode of the battery shown in FIG. 1 and a positive electrode terminal serving as an external terminal and the vicinity thereof.
１ 正極 １ａ アルミニウム箔 １ｂ 正極合剤層 ２ 負極 ２ａ 銅箔 ２ｂ 負極合剤層 ３ ポリマー電解質層 ４ 外装体 ４ａ シール部分 ５ 正極端子 ６ 負極端子 ７ アルミニウム箔と正極端子との接続部分 DESCRIPTION OF SYMBOLS 1 Positive electrode 1a Aluminum foil 1b Positive electrode mixture layer 2 Negative electrode 2a Copper foil 2b Negative electrode mixture layer 3 Polymer electrolyte layer 4 Outer package 4a Sealing part 5 Positive terminal 6 Negative terminal 7 Connection part between aluminum foil and positive electrode terminal
Claims (3)
正極合剤層を形成してなるシート状の正極、銅箔の少な
くとも一方の面に負極合剤層を形成してなるシート状の
負極およびシート状のポリマー電解質層を有し、それら
を外装体で外装するポリマー電解質電池において、上記
正極のアルミニウム箔または該アルミニウム箔に接続し
たアルミニウム製のリード体と正極端子との接続を外装
体のシール部分で行ったことを特徴とするポリマー電解
質電池。1. A sheet-shaped positive electrode having a positive electrode mixture layer formed on at least one surface of an aluminum foil, a sheet-shaped negative electrode and a sheet having a negative electrode mixture layer formed on at least one surface of a copper foil. In a polymer electrolyte battery having a shape-like polymer electrolyte layer and packaging them with a package, the connection between the aluminum foil of the positive electrode or the aluminum lead connected to the aluminum foil and the positive electrode terminal is made by a sealing portion of the package. A polymer electrolyte battery.
質層である請求項１記載のポリマー電解質電池。2. The polymer electrolyte battery according to claim 1, wherein the polymer electrolyte layer is a gel polymer electrolyte layer.
あり、正極端子がニッケルまたはニッケルメッキした
銅、鉄またはステンレス鋼などの金属の箔またはリボン
からなり、その厚みが５０〜２００μｍである請求項１
記載のポリマー電解質電池。3. The aluminum foil has a thickness of 20 μm or less, and the positive electrode terminal is made of a metal foil or ribbon of nickel or nickel-plated copper, iron or stainless steel, and has a thickness of 50 to 200 μm.
The polymer electrolyte battery according to the above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07324398A JP3966602B2 (en) | 1998-03-06 | 1998-03-06 | Polymer electrolyte battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07324398A JP3966602B2 (en) | 1998-03-06 | 1998-03-06 | Polymer electrolyte battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11260343A true JPH11260343A (en) | 1999-09-24 |
| JP3966602B2 JP3966602B2 (en) | 2007-08-29 |
Family
ID=13512557
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07324398A Expired - Fee Related JP3966602B2 (en) | 1998-03-06 | 1998-03-06 | Polymer electrolyte battery |
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| Country | Link |
|---|---|
| JP (1) | JP3966602B2 (en) |
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| JP2002134094A (en) * | 2000-10-20 | 2002-05-10 | Nec Mobile Energy Kk | Enclosed type battery |
| JP2005317315A (en) * | 2004-04-28 | 2005-11-10 | Pionics Co Ltd | Positive electrode terminal for lithium secondary battery |
| US7008720B2 (en) | 2002-04-11 | 2006-03-07 | Nissan Motor Co., Ltd. | Battery having a terminal lead surface covering layer and related method |
| JP2006324143A (en) * | 2005-05-19 | 2006-11-30 | Nissan Motor Co Ltd | Secondary battery |
| CN102916154A (en) * | 2011-08-04 | 2013-02-06 | 株式会社Lg化学 | Secondary battery pack of novel structure |
| CN103769780A (en) * | 2013-12-26 | 2014-05-07 | 合肥国轩高科动力能源股份公司 | Method for welding lithium ion battery stainless steel head cover and copper sheet |
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1998
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002134094A (en) * | 2000-10-20 | 2002-05-10 | Nec Mobile Energy Kk | Enclosed type battery |
| US7008720B2 (en) | 2002-04-11 | 2006-03-07 | Nissan Motor Co., Ltd. | Battery having a terminal lead surface covering layer and related method |
| JP2005317315A (en) * | 2004-04-28 | 2005-11-10 | Pionics Co Ltd | Positive electrode terminal for lithium secondary battery |
| JP2006324143A (en) * | 2005-05-19 | 2006-11-30 | Nissan Motor Co Ltd | Secondary battery |
| CN102916154A (en) * | 2011-08-04 | 2013-02-06 | 株式会社Lg化学 | Secondary battery pack of novel structure |
| JP2013038064A (en) * | 2011-08-04 | 2013-02-21 | Lg Chem Ltd | Secondary battery pack of novel structure |
| CN102916154B (en) * | 2011-08-04 | 2015-07-15 | 株式会社Lg化学 | Secondary battery pack of novel structure |
| US9219266B2 (en) | 2011-08-04 | 2015-12-22 | Lg Chem, Ltd. | Secondary battery pack of novel structure |
| CN103769780A (en) * | 2013-12-26 | 2014-05-07 | 合肥国轩高科动力能源股份公司 | Method for welding lithium ion battery stainless steel head cover and copper sheet |
| CN103769780B (en) * | 2013-12-26 | 2016-05-11 | 合肥国轩高科动力能源有限公司 | The welding method of a kind of lithium ion battery stainless steel top cover and copper sheet |
| CN114068862A (en) * | 2021-11-11 | 2022-02-18 | 苏州达牛新能源科技有限公司 | Battery pole piece based on composite current collector and preparation method thereof |
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