JP2002246269A - Electrochemical element - Google Patents
Electrochemical elementInfo
- Publication number
- JP2002246269A JP2002246269A JP2001043482A JP2001043482A JP2002246269A JP 2002246269 A JP2002246269 A JP 2002246269A JP 2001043482 A JP2001043482 A JP 2001043482A JP 2001043482 A JP2001043482 A JP 2001043482A JP 2002246269 A JP2002246269 A JP 2002246269A
- Authority
- JP
- Japan
- Prior art keywords
- lead terminal
- sealing member
- sealing
- terminal
- current collector
- 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.)
- Pending
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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電池や電気二重層
コンデンサなどのシート型電気化学素子に関し、特に封
止部材の外部に突出するリード端子の改良に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-type electrochemical device such as a battery and an electric double layer capacitor, and more particularly to an improvement in a lead terminal projecting outside a sealing member.
【０００２】[0002]
【従来技術】近年、リチウム系の二次電池や電気二重層
コンデンサ等の電気化学素子が注目されている。中で
も、電気二重層コンデンサは、電極と電解液との界面に
おいてイオンの分極によりできる電気二重層を利用した
もので、コンデンサと電池の両方の機能を兼ね備えたも
のであり、従来のコンデンサと比較して大容量の静電容
量を充電できるとともに、急速充放電が可能であること
から、小型のメモリーバックアップ電源や自動車の駆動
源等、大容量モータなどの補助電源として注目されてい
る。2. Description of the Related Art In recent years, electrochemical devices such as lithium secondary batteries and electric double layer capacitors have been receiving attention. Among them, the electric double layer capacitor utilizes an electric double layer formed by the polarization of ions at the interface between the electrode and the electrolyte, and has both functions of a capacitor and a battery. It has been attracting attention as an auxiliary power supply for a large-capacity motor, such as a small-sized memory backup power supply or a driving source for a car, because it can charge a large capacity electrostatic capacity and can rapidly charge and discharge.
【０００３】かかる電気二重層コンデンサの構成の一例
として、活性炭および電解液を含有する２枚の分極性電
極間に絶縁性の多孔質体からなるセパレータを介し、前
記分極性電極の前記セパレータ側の面とは反対の表面そ
れぞれに金属箔等からなる集電体を配設した積層体から
なるセルが、所望により、複数層積層されて高分子フィ
ルムからなるラミネートフィルム等の袋体状の封止部材
内に収納され、その開口部から電気二重層コンデンサ内
部と外部回路とを電気的に接続するリード端子が突出し
た状態で、該開口部を熱融着（ヒートシール）等により
封止した構成からなる電気二重層コンデンサが知られて
いる。As an example of the configuration of such an electric double layer capacitor, a separator made of an insulating porous material is interposed between two polarizable electrodes containing activated carbon and an electrolytic solution, and the polarizer is located on the separator side of the polarizable electrode. A cell made of a laminate in which a current collector made of a metal foil or the like is disposed on each surface opposite to the surface, if desired, is sealed in a bag-like shape such as a laminated film made of a polymer film in which a plurality of layers are laminated. A configuration in which a lead terminal for electrically connecting the inside of an electric double-layer capacitor and an external circuit is protruded from an opening of the member, and the opening is sealed by heat fusion (heat sealing) or the like. Is known.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上述し
た従来の電気二重層コンデンサでは、袋体状にリード端
子を挟んだ状態で熱融着することから、袋体状とリード
端子との間の密着が不十分で、隙間が生じてしまい、こ
の隙間から電気二重層コンデンサ内部の電解液が液漏れ
したり、また、この隙間から大気中の水分が浸入して、
電解液が水分の作用によって分解する結果、電気二重層
コンデンサの静電容量が低下するという問題があった。However, in the above-mentioned conventional electric double-layer capacitor, the lead terminals are sandwiched between the bag and heat-fused, so that the close contact between the bag and the lead terminals is caused. Insufficiently, a gap is created, the electrolyte in the electric double layer capacitor leaks from this gap, and the moisture in the atmosphere enters from this gap,
As a result of the decomposition of the electrolytic solution by the action of moisture, there has been a problem that the capacitance of the electric double layer capacitor is reduced.
【０００５】また、封止部材の封止性を高めるためにリ
ード端子の横断面を円や楕円形状とすることも考えられ
るが、この場合にはリード端子と集電体の端子部との溶
接性が低下してしまい、電気二重層コンデンサの内部抵
抗を増大させる恐れがあった。In order to enhance the sealing property of the sealing member, it is conceivable to make the cross section of the lead terminal circular or elliptical. In this case, however, the welding between the lead terminal and the terminal portion of the current collector is considered. There is a possibility that the resistance may decrease and the internal resistance of the electric double layer capacitor may increase.
【０００６】本発明は、上記課題に対してなされたもの
で、その目的は、袋体状の封止部材を具備する電気化学
素子において、リード端子を挟んだ状態であっても封止
部材の封止部に隙間等が発生することなく良好な密着状
態を安定して維持できるとともに、集電体との電気的接
続信頼性の高い電気化学素子を提供することにある。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide an electrochemical device having a bag-shaped sealing member. An object of the present invention is to provide an electrochemical device which can stably maintain a good adhesion state without generating a gap or the like in a sealing portion and has high reliability of electrical connection with a current collector.
【０００７】[0007]
【課題を解決するための手段】本発明者等は、上記課題
に対して検討した結果、リード端子の形状を前記リード
端子の前記開口（封口）部での横断面における中央部が
概略長方形であり、かつ端部が先細りした形状とするこ
とによって、リード端子を挟んだ状態であっても隙間等
が発生することなく良好な密着状態を安定して維持でき
るとともに、集電体との電気的接続信頼性の高い電気化
学素子となることを知見した。As a result of studying the above problem, the present inventors have found that the shape of the lead terminal is substantially rectangular at the center in the cross section at the opening (sealing) of the lead terminal. By having a tapered shape with an end portion, a good adhesion state can be stably maintained without a gap or the like even when the lead terminal is sandwiched, and the electrical contact with the current collector can be maintained. It has been found that the electrochemical device has high connection reliability.
【０００８】すなわち、本発明の電気化学素子は、シー
ト状のセパレータを介在させて積層した一対のシート状
電極の表面それぞれに、端部に端子部を有するシート状
の集電体を積層したセル積層体の少なくとも１組を袋体
状の封止部材内に収容するとともに、前記集電体の端子
部にリード端子を溶接し、かつ該リード端子を前記封止
部材の開口部から外部に突出するようにして前記封止部
材の開口部を封口してなるものであって、前記リード端
子の前記開口部での横断面における形状が、中央部領域
は概略長方形、端部は先細りをなしていることを特徴と
するものである。That is, the electrochemical element of the present invention has a cell in which a sheet-like current collector having a terminal portion at an end is laminated on each surface of a pair of sheet-like electrodes laminated with a sheet-like separator interposed therebetween. At least one set of the laminates is accommodated in a bag-shaped sealing member, and a lead terminal is welded to a terminal portion of the current collector, and the lead terminal is projected outside from an opening of the sealing member. In this manner, the opening of the sealing member is sealed, and the shape of the lead terminal in the cross section at the opening is substantially rectangular in the central region, and the end portion is tapered. It is characterized by having.
【０００９】ここで、前記リード端子の全体の幅
（ｗ1）に対する前記リード端子の長方形部の幅（ｗ2）
の比（ｗ2／ｗ1）が０．４〜０．９であること、前記リ
ード端子の表面粗さ（Ｒａ）が０．１〜１００μｍであ
ることが望ましい。Here, the width (w 2 ) of the rectangular portion of the lead terminal relative to the entire width (w 1 ) of the lead terminal
The ratio of (w 2 / w 1) is 0.4 to 0.9 that, it is desired surface roughness of the lead terminals (Ra) is 0.1 to 100 [mu] m.
【００１０】[0010]
【発明の実施の形態】本発明の電気化学素子について、
その一例である電気二重層コンデンサの概略断面図であ
る図１および平面図である図２を基に説明する。図１、
２によれば、電気二重層コンデンサ１は、正極および負
極をなす分極性電極２、２間にセパレータ３が配設、介
在しており、また、分極性電極２、２のセパレータ接着
面の反対面には正極および負極をなす集電体４、４がそ
れぞれ積層、接着されている。BEST MODE FOR CARRYING OUT THE INVENTION The electrochemical device of the present invention is described below.
An example of the electric double layer capacitor will be described with reference to FIG. 1 which is a schematic sectional view and FIG. 2 which is a plan view. Figure 1,
According to 2, the electric double layer capacitor 1 has the separator 3 disposed and interposed between the polarizable electrodes 2 and 2 serving as a positive electrode and a negative electrode, and the opposite of the polarizable electrodes 2 and 2 from the separator bonding surface. On the surface, current collectors 4 forming a positive electrode and a negative electrode are laminated and bonded respectively.
【００１１】また、図１、２によれば、集電体４−分極
性電極２−セパレータ３−分極性電極２−集電体４のセ
ル積層体５が袋体状の封止部材６内に収納され、かつ封
止部材６の開口部は２層の封止部材６同士を熱融着等に
て封口することによって密閉、封止されている。さら
に、封止部材６の封口（開口）部６ａでは封止部材６の
内部と外部とを電気的に接続するための一対のリード端
子７（７ａ、７ｂ）が挟持された状態で密閉、封止され
ている。According to FIGS. 1 and 2, the cell laminate 5 of the current collector 4-the polarizable electrode 2-the separator 3-the polarizable electrode 2-the current collector 4 has a bag-like sealing member 6. The opening of the sealing member 6 is hermetically sealed and sealed by sealing the two layers of the sealing member 6 by heat sealing or the like. Furthermore, at a sealing (opening) portion 6a of the sealing member 6, a pair of lead terminals 7 (7a, 7b) for electrically connecting the inside and the outside of the sealing member 6 are sealed and sealed in a state of being sandwiched. Has been stopped.
【００１２】さらに、集電体４の一端には帯状の端子部
４ａが形成され、端子部４ａはリード端子７と封止部材
６内にて溶接することにより電気的に接続されている。Further, a strip-shaped terminal portion 4a is formed at one end of the current collector 4, and the terminal portion 4a is electrically connected to the lead terminal 7 by welding in the sealing member 6.
【００１３】本発明によれば、リード端子７が封止部材
６の封口部６ａでの横断面における中央部が概略長方形
であり、かつ端部が先細りした形状からなることが大き
な特徴であり、これによって、図３の封止部材６の封口
部６ａについての概略断面図に示すように、リード端子
を挟んだ状態であっても封止部材６の封口部６ａに隙間
等が発生することなく良好な密着状態を安定して維持で
きるとともに、集電体４の端子部４ａとの溶接による電
気的接続信頼性を維持できる。According to the present invention, it is a major feature that the lead terminal 7 has a substantially rectangular shape at the center in the cross section at the sealing portion 6a of the sealing member 6 and has a tapered end. Thereby, as shown in a schematic cross-sectional view of the sealing portion 6a of the sealing member 6 in FIG. 3, even when the lead terminal is sandwiched, no gap or the like is generated in the sealing portion 6a of the sealing member 6. A good contact state can be stably maintained, and the reliability of electrical connection by welding the current collector 4 to the terminal portion 4a can be maintained.
【００１４】すなわち、リード端子７の横断面において
先細り部が形成されないと、封止部材６の封口部６ａと
挟持されるリード端子７との間に隙間が生じてしまい電
気二重層コンデンサ１の封止性が悪くなり、電解液の分
解等が進行して電気二重層コンデンサの内部抵抗の増大
や寿命が短くなる。また、リード端子７の横断面におけ
る中央部領域の形状が概略長方形でなく円や楕円である
とリード端子７と集電体４の端子部４ａとの溶接性が低
下して電気二重層コンデンサ１の内部抵抗が高くなる。That is, if a tapered portion is not formed in the cross section of the lead terminal 7, a gap is formed between the sealing portion 6a of the sealing member 6 and the lead terminal 7 to be sandwiched, and the sealing of the electric double layer capacitor 1 is performed. As a result, the decomposition of the electrolytic solution proceeds, and the internal resistance of the electric double layer capacitor increases and its life is shortened. If the shape of the central region in the cross section of the lead terminal 7 is not a rectangle but a circle or an ellipse, the weldability between the lead terminal 7 and the terminal portion 4a of the current collector 4 is reduced, and the electric double layer capacitor 1 Internal resistance increases.
【００１５】なお、リード端子７の封止部材６の封口部
６ａ以外の部分の形状については必ずしも両端が先細り
した形状である必要はなく、この部分の横断面形状が全
体として概略長方形であってもよい。また、図１では、
集電体４−分極性電極２−セパレータ３−分極性電極２
−集電体４のセル積層体５が１組のみ存在するものであ
ったが、本発明はこれに限定されるものではなく、セル
積層体５が複数組配設されていてもよい。The shape of the portion of the lead terminal 7 other than the sealing portion 6a of the sealing member 6 does not necessarily have to be tapered at both ends, and the cross-sectional shape of this portion is generally rectangular as a whole. Is also good. Also, in FIG.
Current collector 4-Polarizable electrode 2-Separator 3-Polarizable electrode 2
-Although only one set of the cell stack 5 of the current collector 4 exists, the present invention is not limited to this, and a plurality of sets of the cell stack 5 may be provided.
【００１６】ここで、リード端子７の横断面形状は、図
４に示すように、（ａ）概略長方形の角部にテーパーを
設けたもの、（ｂ）概略長方形の角部にＲ部を設けたも
の、（ｃ）両端が両面から削られ、先細り部の断面が二
等辺三角形形状の尖頭形状をなすもの、（ｄ）両端が片
面から削られ、先細り部の断面が直角三角形形状の尖頭
形状をなすものが好適に挙げられる。Here, as shown in FIG. 4, the cross-sectional shape of the lead terminal 7 is such that (a) a taper is provided at a corner of a substantially rectangular shape, and (b) an R portion is provided at a corner of the substantially rectangular shape. (C) Both ends are shaved from both sides, and the cross section of the tapered portion has a pointed shape with an isosceles triangular shape. Those having a head shape are preferred.
【００１７】また、封止部材６の封止性を高めつつ、リ
ード端子７と集電体４の端子部４ａとの溶接性を高める
ためには、例えば、図４（ｃ）のリード端子７の横断面
に示すように、リード端子７の全体の幅ｗ1に対するリ
ード端子７の長方形部の幅ｗ2の比（ｗ2／ｗ1）が０．
４〜０．９であることが望ましい。In order to improve the weldability between the lead terminal 7 and the terminal portion 4a of the current collector 4 while improving the sealing property of the sealing member 6, for example, the lead terminal 7 shown in FIG. As shown in the cross section, the ratio (w 2 / w 1 ) of the width w 2 of the rectangular portion of the lead terminal 7 to the entire width w 1 of the lead terminal 7 is 0.
Desirably, it is 4 to 0.9.
【００１８】さらに、本発明によれば、封止部材６とリ
ード端子７との密着性を高めて、両者間の封止信頼性を
高めるために、リード端子７の表面粗さ（Ｒａ）が０．
１〜１００μｍ、特に０．１〜５０μｍ、さらに１〜１
０μｍであることが望ましい。Further, according to the present invention, the surface roughness (Ra) of the lead terminal 7 is increased in order to enhance the adhesion between the sealing member 6 and the lead terminal 7 and to enhance the sealing reliability between the two. 0.
1 to 100 μm, especially 0.1 to 50 μm, furthermore 1 to 1
Desirably, it is 0 μm.
【００１９】（各部材の構成）一方、分極性電極２を構
成する活性炭質構造体は、高い比表面積を有する活性炭
粒子と、前記活性炭粒子を結合するための結合剤とを配
合したものを主成分とするものであり、これを炭化処理
したものであってもよい。(Structure of each member) On the other hand, the activated carbonaceous structure constituting the polarizable electrode 2 mainly comprises a mixture of activated carbon particles having a high specific surface area and a binder for binding the activated carbon particles. It is a component, which may be carbonized.
【００２０】また、コンデンサの高静電容量を維持し、
構造体として必要な強度を得るためには、前記活性炭の
比表面積が１０００〜１８００ｍ2／ｇであることが望
ましい。Further, maintaining the high capacitance of the capacitor,
In order to obtain the required strength as a structure, the activated carbon desirably has a specific surface area of 1,000 to 1,800 m 2 / g.
【００２１】なお、前記結合剤として添加される炭素成
分は、前記活性炭粒子間に存在するが、前記炭化処理を
施す場合には、前記活性炭質構造体に占める割合が５〜
５０重量％であることが好ましく、これにより前記活性
炭粒子間の焼結性及び結合性を高めることができる。The carbon component added as the binder is present between the activated carbon particles, but when the carbonization treatment is performed, the ratio of the carbon component to the activated carbonaceous structure is 5 to 5.
The content is preferably 50% by weight, whereby the sinterability and bonding between the activated carbon particles can be enhanced.
【００２２】さらに分極性電極２は板状であることが好
ましく、キャパシタ製造時の取り扱いや使用時の振動、
衝撃等に耐えうる機械的強度という信頼性の点でＪＩＳ
Ｒ１６０１に準じた室温における３点曲げ強度が３０ｋ
Ｐａ以上、特に６０ｋＰａ以上であることが好ましい。
また、分極性電極２の厚みは、内部抵抗の低減の観点か
ら１．５ｍｍ以下、特に０．６ｍｍ以下であることが好
ましい。Further, the polarizable electrode 2 is preferably in the form of a plate.
JIS in terms of reliability of mechanical strength that can withstand impacts etc.
30k 3-point bending strength at room temperature according to R1601
It is preferably at least Pa, especially at least 60 kPa.
Further, the thickness of the polarizable electrode 2 is preferably 1.5 mm or less, particularly preferably 0.6 mm or less from the viewpoint of reducing the internal resistance.
【００２３】また、セパレータ３は、パルプやポリエチ
レン、ポリプロピレン、ポリビニリデンフロライド（Ｐ
ＶｄＦ）等の有機フィルムまたはガラス繊維不織布及び
セラミックスなどを用いることができ、分極性電極２間
を絶縁するために形成されるものであるが、分極性電極
２内に含有される電解液中のイオンを透過させることが
できる多孔質体により形成される。The separator 3 is made of pulp, polyethylene, polypropylene, polyvinylidene fluoride (P
An organic film such as VdF) or a glass fiber nonwoven fabric and ceramics can be used, and are formed to insulate the polarizable electrodes 2 from each other. It is formed of a porous body through which ions can pass.
【００２４】また、集電体４は、導電性を有するアルミ
ニウム、チタン、タンタル、白金、金等の金属箔、ステ
ンレス鋼などにより形成され、分極性電極２、２間で電
荷をやり取りするが、特に分解電圧の高い非水系電解液
に対する耐食性の点でアルミニウムを主体とする金属箔
からなることが望ましい。耐電解液性の各種金属を使用
することが好ましい。また、集電体４の厚みは内部抵抗
を低減するためには薄いものが好ましいが組立時の取り
扱いなどによる破損を考慮すると０．０２〜０．１０ｍ
ｍ程度が望ましい。The current collector 4 is made of conductive metal foil, such as aluminum, titanium, tantalum, platinum, or gold, or stainless steel, and exchanges electric charge between the polarizable electrodes 2 and 2. In particular, it is desirable to use a metal foil mainly composed of aluminum from the viewpoint of corrosion resistance to a non-aqueous electrolyte having a high decomposition voltage. It is preferable to use various metals having electrolytic resistance. The thickness of the current collector 4 is preferably thin in order to reduce the internal resistance, but is 0.02 to 0.10 m in consideration of damage due to handling during assembly.
m is desirable.
【００２５】他方、分極性電極２と、セパレータ３に含
浸される電解液としては硫酸や硝酸などの水溶液や、エ
チレンカーボネート（ＥＣ）、プロピレンカーボネート
（ＰＣ）、ブチレンカーボネート（ＢＣ）、γ―ブチロ
ラクトン（γ―ＢＬ）、Ｎ，Ｎ−ジメチルホルムアミ
ド、スルホラン、３−メチルスルホラン等の非水溶媒と
４級アンモニウム塩、４級スルホニウム塩、４級ホスホ
ニウム塩等の電解質を組み合わせた非水系電解液が使用
可能であるが、本発明においては分解電圧の高い非水系
電解液を用いることが望ましい。なお、前記電解質の前
記非水溶媒に対する溶解量は、０．５〜２．０ｍｏｌ／
ｌとすることが安定し、かつ高い静電容量を得る点で好
ましい。On the other hand, the electrolytic solution impregnated in the polarizable electrode 2 and the separator 3 may be an aqueous solution such as sulfuric acid or nitric acid, ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), γ-butyrolactone. (Γ-BL), N, N-dimethylformamide, sulfolane, 3-methylsulfolane and other nonaqueous solvents and quaternary ammonium salts, quaternary sulfonium salts, quaternary phosphonium salts and other nonaqueous electrolyte solutions are combined. Although it can be used, in the present invention, it is desirable to use a non-aqueous electrolyte having a high decomposition voltage. The amount of the electrolyte dissolved in the nonaqueous solvent was 0.5 to 2.0 mol / mol.
It is preferable to set it to 1 in order to obtain a stable and high capacitance.
【００２６】また、封止部材６は袋体状からなり、外気
や水分に対してバリア機能を有するものであり、例え
ば、少なくとも封口部に熱融着性を示す樹脂が配され、
かつ、内部にアルミニウムのような金属箔を介在させた
ラミネートフィルム等を挙げることができる。具体的に
は、封口部側から外面に向かって積層した酸変性ポリプ
ロピレン（ＰＰ）/ポリエチレンテレフタレート（ＰＥ
Ｔ）/Ａｌ箔/ＰＥＴのラミネートフィルム、酸変性ポリ
エチレン（ＰＥ）/ナイロン/Ａｌ箔/ＰＥＴのラミネー
トフィルム、アイオノマー/Ｎｉ箔/ＰＥ/ＰＥＴのラミ
ネートフィルム、エチレンビニルアセテート（ＥＶＡ）
/ＰＥ/Ａｌ箔/ＰＥＴのラミネートフィルム、アイオノ
マー/ＰＥＴ/Ａｌ箔/ＰＥＴのラミネートフィルム等を
用いることができる。ここで、封口部側にはポリオレフ
ィンの１種である酸変性ポリエチレン（ＰＥ）、酸変性
ポリプロピレン（ＰＰ）や、アイオノマー、エチレンビ
ニルアセテート（ＥＶＡ）は防湿性、耐通気性、耐薬品
性を有するものである。The sealing member 6 has a bag shape and has a barrier function against the outside air and moisture. For example, at least a sealing resin is provided at the sealing portion,
In addition, a laminate film having a metal foil such as aluminum interposed therein can be used. Specifically, acid-modified polypropylene (PP) / polyethylene terephthalate (PE) laminated from the sealing portion side to the outer surface
T) / Al foil / PET laminate film, acid-modified polyethylene (PE) / nylon / Al foil / PET laminate film, ionomer / Ni foil / PE / PET laminate film, ethylene vinyl acetate (EVA)
A laminated film of / PE / Al foil / PET, an ionomer / PET / Al foil / PET laminated film, and the like can be used. Here, on the side of the sealing portion, acid-modified polyethylene (PE), acid-modified polypropylene (PP), ionomer, and ethylene vinyl acetate (EVA), which are one kind of polyolefin, have moisture resistance, gas permeability, and chemical resistance. Things.
【００２７】また、リード端子７は、強度、抵抗値の低
減、封止部材の封止性の点で厚み０．１〜１．０ｍｍの
アルミニウム、銀、白金、金等の金属板からなる。ま
た、リード端子７に上述の先細り部を形成するには、板
状のリード端子の両側端を研磨板やラップ板、ヤスリ等
によって研磨するか、またはカンナやナイフ等を用いて
削り出す方法によって容易に作製することができる。The lead terminal 7 is made of a metal plate of aluminum, silver, platinum, gold or the like having a thickness of 0.1 to 1.0 mm from the viewpoints of strength, resistance value reduction, and sealing property of the sealing member. Further, in order to form the above-mentioned tapered portion on the lead terminal 7, both ends of the plate-like lead terminal are polished with a polishing plate, a lap plate, a file, or the like, or cut out using a canner, a knife, or the like. It can be easily manufactured.
【００２８】また、図１では電気二重層コンデンサにつ
いて説明したが、本発明はこれに限定されるものではな
く、例えば、リチウム電池、ニッケル水素電池等につい
ても上記同様に好適に用いることができるが、封止性に
よってコンデンサの特性が大きく変化してしまう電気二
重層コンデンサに対して特に有効である。Although the electric double layer capacitor has been described with reference to FIG. 1, the present invention is not limited to this. For example, a lithium battery, a nickel hydride battery and the like can be suitably used as described above. This is particularly effective for an electric double layer capacitor in which the characteristics of the capacitor greatly change due to the sealing property.
【００２９】[0029]
【実施例】活性炭１００重量部に対して、ポリテトラフ
ルオロエチレン（ＰＴＦＥ）を１００重量部添加、混合
した混合粉末を、ロール成形して厚み１５０μｍのシー
トを作製し、１００ｍｍ×１００ｍｍのシート状にカッ
トした活性炭質構造体を作製した。また、パルプ製の１
０２ｍｍ×１０２ｍｍ×厚み５０μｍのシート状のセパ
レータ、および１００ｍｍ×１００ｍｍ×厚み３０μｍ
で、その一辺の端部に幅３０ｍｍの帯状の端子部を備え
たアルミニウム箔製の集電体を準備した。EXAMPLE 100 parts by weight of polytetrafluoroethylene (PTFE) was added to 100 parts by weight of activated carbon, and the mixed powder obtained by mixing was roll-formed to prepare a 150-μm-thick sheet, which was formed into a sheet of 100 mm × 100 mm. A cut activated carbonaceous structure was produced. In addition, one made of pulp
02 mm × 102 mm × 50 μm thick sheet-like separator, and 100 mm × 100 mm × 30 μm thick
Then, a current collector made of aluminum foil having a band-shaped terminal portion having a width of 30 mm at one end thereof was prepared.
【００３０】これら各構成部材を真空雰囲気下で乾燥し
た後、非酸化性雰囲気下にて、集電体−分極性電極−セ
パレータ−分極性電極（−集電体）を一単位セルとして
セル２９層を積層したセル積層体を作製した。なお、セ
ル積層体の両方の最端面には集電体が位置するように配
設し、セル積層体は集電体３０枚、分極性電極５８枚、
セパレータ２９枚にて構成されるものとし、また、集電
体の端子部がセル積層体の同じ側面から突出し、かつ隣
接する各端子が反対の隅部に交互に配設されるようにし
て積層した。After drying these constituent members in a vacuum atmosphere, a cell 29 is formed under a non-oxidizing atmosphere by using a current collector-polarizable electrode-separator-polarizable electrode (current collector) as one unit cell. A cell laminate in which the layers were laminated was produced. In addition, the current collector is disposed on both end surfaces of the cell stack, and the cell stack has 30 current collectors, 58 polarizable electrodes,
The separator is composed of 29 separators, and the terminals of the current collector project from the same side surface of the cell stack, and the adjacent terminals are alternately arranged at opposite corners. did.
【００３１】また、厚み１．０ｍｍのアルミニウム板を
幅３０ｍｍ×７０ｍｍに切り出すとともに、その幅方向
の両端を研磨板にて研磨することによって表１に示す横
断面形状のリード端子を２本作製した。このリード端子
の封口（開口）部に位置する外周にポリプロピレン被膜
を形成した。An aluminum plate having a thickness of 1.0 mm was cut into a width of 30 mm × 70 mm, and both ends in the width direction were polished with a polishing plate to produce two lead terminals having a cross section shown in Table 1. . A polypropylene coating was formed on the outer periphery of the lead terminal located at the sealing (opening) portion.
【００３２】次に、セル積層体の外周表面に突出した同
じ隅部に位置する（同極をなす）集電体同士とリード端
子をそれぞれ超音波溶接によって接続して、正極用リー
ド端子および負極用リード端子とした後、ラミネートフ
ィルムの外袋体に挿入した。Next, the current collectors (having the same polarity) located at the same corner protruding from the outer peripheral surface of the cell laminate are connected to the lead terminals by ultrasonic welding, respectively. After that, the lead terminal was inserted into the outer bag of the laminated film.
【００３３】そして、１ｍｏｌ／ｌのテトラエチルアン
モニウムテトラフルオロボレート（Ｅｔ4ＮＢＦ4）のプ
ロピレンカーボネート（ＰＣ）溶液からなる非水系電解
液を注入して、分極性電極およびセパレータ内に電解液
を含浸させた後、リード端子を封止部材の開口部から外
部に突出させた状態で、封止部材の開口部を熱圧着して
封口した。Then, a non-aqueous electrolytic solution composed of a propylene carbonate (PC) solution of 1 mol / l of tetraethylammonium tetrafluoroborate (Et 4 NBF 4 ) is injected to impregnate the polarizable electrode and the separator with the electrolytic solution. After that, with the lead terminals protruding outside from the opening of the sealing member, the opening of the sealing member was sealed by thermocompression bonding.
【００３４】得られた電気二重層コンデンサ１００個に
対して、リード端子部からの液漏れが発生した個数を求
め、歩留まり（％）を算出した。また、１ｋＨｚ、５０
Ａにてインピーダンス測定を行い、内部抵抗を算出し
た。さらに、７０℃、２．５Ｖで、電流５０Ａにて充放
電をそれぞれ５０時間づつ行い、この充放電を１０００
時間続けた前後の静電容量の変化率を測定した。結果は
表１に示した。With respect to the obtained 100 electric double layer capacitors, the number of leaks from the lead terminals was determined, and the yield (%) was calculated. In addition, 1 kHz, 50
The impedance was measured at A, and the internal resistance was calculated. Further, charging and discharging were performed at 70 ° C. and 2.5 V at a current of 50 A for 50 hours, and the charging and discharging were performed for 1000 hours.
The rate of change of the capacitance before and after the continuous time was measured. The results are shown in Table 1.
【００３５】[0035]
【表１】 [Table 1]
【００３６】表１より、リード端子の横断面において先
細り部がない試料Ｎｏ．１では、封止性が悪く、封止部
材の封口（開口）部から液漏れが生じ、歩留まりが低く
なった。また、中央部に長方形部を形成しない試料Ｎ
ｏ．１０および横断面形状が円形である試料Ｎｏ．１２
では、リード端子と集電体の端子部との溶接性が低下し
て電気二重層コンデンサの内部抵抗が増大した。From Table 1, it is found that Sample No. having no tapered portion in the cross section of the lead terminal. In No. 1, the sealing property was poor, and liquid leakage occurred from the sealing (opening) portion of the sealing member, resulting in a low yield. In addition, the sample N which does not form a rectangular portion in the center portion
o. Sample No. 10 and Sample No. 10 having a circular cross-sectional shape. 12
In this case, the weldability between the lead terminal and the terminal portion of the current collector decreased, and the internal resistance of the electric double layer capacitor increased.
【００３７】これに対して、本発明に従い、前記封口
（開口）部での横断面における中央部領域が概略長方形
であり、かつ端部が先細りした形状からなる形状のリー
ド端子を具備する試料Ｎｏ．２〜９、１１では、歩留ま
りが８５％以上、内部抵抗が２．５ｍΩ以下、１０００
時間後の静電容量の変化（低下）率が１０％以下の優れ
た特性を有するものであった。中でも、前記リード端子
の全体の幅（ｗ1）に対する前記リード端子の長方形部
の幅（ｗ2）の比（ｗ2／ｗ1）が０．４〜０．９であ
り、前記リード端子の表面粗さ（Ｒａ）が０．１〜１０
０μｍである試料Ｎｏ．２、４〜６、８、１１では、歩
留まりが８７％以上、内部抵抗が２．３ｍΩ以下、１０
００時間後の静電容量の変化（低下）率が１０％以下の
優れた特性を有していた。On the other hand, in accordance with the present invention, a sample No. having a lead terminal in which the central region in the cross section at the sealing (opening) portion is substantially rectangular and the end portion is tapered. . In the cases of 2 to 9 and 11, the yield is 85% or more, the internal resistance is 2.5 mΩ or less,
The rate of change (decrease) in capacitance after time was 10% or less, and had excellent characteristics. Among them, the ratio of the total width of the lead terminals rectangular section of a width of the lead terminal for (w 1) (w 2) (w 2 / w 1) is 0.4 to 0.9, of the lead terminal Surface roughness (Ra) of 0.1 to 10
Sample No. 0 μm. For 2, 4 to 6, 8, and 11, the yield was 87% or more and the internal resistance was 2.3 mΩ or less.
It had excellent characteristics in which the rate of change (decrease) in capacitance after 00 hours was 10% or less.
【００３８】[0038]
【発明の効果】以上詳述しように、本発明の電気化学素
子では、リード端子の形状を前記リード端子の前記封口
（開口）部での横断面における中央部領域が概略長方形
であり、かつ端部が先細りした形状とすることによっ
て、リード端子を挟んだ状態であっても隙間等が発生す
ることなく良好な密着状態を安定して維持できるととも
に、集電体との電気的接続信頼性の高い電気化学素子と
なる。As described above in detail, in the electrochemical device of the present invention, the shape of the lead terminal is such that the center region in the cross section at the sealing (opening) portion of the lead terminal is substantially rectangular, and By making the portion tapered, it is possible to stably maintain a good adhesion state without any gap even when the lead terminal is sandwiched, and to improve the reliability of electrical connection with the current collector. It becomes a high electrochemical element.
【００３９】また、リード端子の全体の幅（ｗ1）に対
する上記中央部領域の幅（ｗ2）の比（ｗ2／ｗ1）を
０．４〜０．９とすること、リード端子の表面粗さ（Ｒ
ａ）を０．１〜１００μｍとすることによって、封止部
材の封止性およびリード端子と集電体の端子部との溶接
性がさらに向上する。The ratio (w 2 / w 1 ) of the width (w 2 ) of the central region to the entire width (w 1 ) of the lead terminal is set to 0.4 to 0.9, Surface roughness (R
By setting a) to 0.1 to 100 μm, the sealing property of the sealing member and the weldability between the lead terminal and the terminal portion of the current collector are further improved.
【図１】本発明の電気化学素子の好適例である電気二重
層コンデンサの一例を示す概略断面図である。FIG. 1 is a schematic sectional view showing an example of an electric double-layer capacitor which is a preferred example of an electrochemical device of the present invention.
【図２】図１の電気二重層コンデンサの平面図である。FIG. 2 is a plan view of the electric double layer capacitor of FIG.
【図３】図１の電気二重層コンデンサの封止部材の封口
（開口）部についての要部拡大図である。3 is an enlarged view of a main part of a sealing (opening) portion of a sealing member of the electric double layer capacitor of FIG. 1;
【図４】本発明の電気化学素子のリード端子の横断面形
状を説明するための模式図である。FIG. 4 is a schematic diagram for explaining a cross-sectional shape of a lead terminal of the electrochemical device of the present invention.
１・・・電気二重層コンデンサ ２・・・分極性電極 ３・・・セパレータ ４・・・集電体 ４ａ・・端子部 ５・・・セル積層体 ６・・・封止部材 ６ａ・・封口（開口）部 ７・・・リード端子 DESCRIPTION OF SYMBOLS 1 ... Electric double layer capacitor 2 ... Polarizable electrode 3 ... Separator 4 ... Current collector 4a ... Terminal part 5 ... Cell laminated body 6 ... Sealing member 6a ... Sealing (Opening) 7: Lead terminal
───────────────────────────────────────────────────── フロントページの続き (72)発明者 島津 健児 鹿児島県国分市山下町１番４号 京セラ株 式会社総合研究所内 Ｆターム(参考） 5H022 AA09 BB11 CC03 EE01 EE03 EE04 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kenji Shimazu 1-4-4 Yamashitacho, Kokubu-shi, Kagoshima F-term in Kyocera Research Institute 5H022 AA09 BB11 CC03 EE01 EE03 EE04
Claims (3)
た一対のシート状電極の表面それぞれに、端部に端子部
を有するシート状の集電体を積層したセル積層体の少な
くとも１組を袋体状の封止部材内に収容するとともに、
前記集電体の端子部にリード端子を溶接し、かつ該リー
ド端子を前記封止部材の開口部から外部に突出するよう
にして前記封止部材の開口部を封口してなる電気化学素
子において、前記リード端子の前記開口部での横断面形
状が中央部領域は概略長方形、端部は先細り状をなして
いることを特徴とする電気化学素子。1. A bag comprising at least one set of a cell laminate in which a sheet-like current collector having a terminal portion at an end is laminated on each surface of a pair of sheet-like electrodes laminated with a sheet-like separator interposed therebetween. While housed in a body-shaped sealing member,
A lead element is welded to a terminal part of the current collector, and the lead terminal is projected from the opening of the sealing member to the outside to seal the opening of the sealing member. An electrochemical device wherein a cross-sectional shape of the lead terminal at the opening is substantially rectangular in a central region and tapered at an end.
る前記リード端子の長方形部の幅（ｗ2）の比（ｗ2／ｗ
1）が０．４〜０．９であることを特徴とする請求項１
記載の電気化学素子。 2. The ratio (w 2 / w) of the width (w 2 ) of the rectangular portion of the lead terminal to the entire width (w 1 ) of the lead terminal.
2. The method according to claim 1, wherein 1 ) is 0.4 to 0.9.
An electrochemical device according to claim 1.
１〜１００μｍであることを特徴とする請求項１または
２記載の電気化学素子。3. A lead terminal having a surface roughness (Ra) of 0.5.
The electrochemical device according to claim 1, wherein the thickness is 1 to 100 μm.
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|---|---|---|---|
| JP2001043482A JP2002246269A (en) | 2001-02-20 | 2001-02-20 | Electrochemical element |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001043482A JP2002246269A (en) | 2001-02-20 | 2001-02-20 | Electrochemical element |
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| Publication Number | Publication Date |
|---|---|
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ID=18905635
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| CN101897057A (en) * | 2007-12-12 | 2010-11-24 | 锂电池科技有限公司 | Main lead for a galvanic cell |
| US8486561B2 (en) | 2009-11-27 | 2013-07-16 | Tdk Corporation | Electrochemical device and manufacturing method thereof |
| JP2014017175A (en) * | 2012-07-10 | 2014-01-30 | Sumitomo Electric Ind Ltd | Lead conductor, and electric power storage device |
| JP2014017174A (en) * | 2012-07-10 | 2014-01-30 | Sumitomo Electric Ind Ltd | Characteristic evaluation method of lead conductor, and method of manufacturing lead conductor |
| JP2016106361A (en) * | 2016-01-12 | 2016-06-16 | 藤森工業株式会社 | Electrode lead member for nonaqueous battery |
| JP2019517145A (en) * | 2016-05-20 | 2019-06-20 | エイブイエックス コーポレイション | Multi-cell ultra capacitor |
| JP2019517146A (en) * | 2016-05-20 | 2019-06-20 | エイブイエックス コーポレイション | Ultra capacitor used at high temperature |
| JP2022058783A (en) * | 2016-05-20 | 2022-04-12 | キョーセラ・エイブイエックス・コンポーネンツ・コーポレーション | Multi-cell ultracapacitor |
| JP7061971B2 (en) | 2016-05-20 | 2022-05-02 | キョーセラ・エイブイエックス・コンポーネンツ・コーポレーション | Multicell ultracapacitor |
| JP7191699B2 (en) | 2016-05-20 | 2022-12-19 | キョーセラ・エイブイエックス・コンポーネンツ・コーポレーション | Ultracapacitor used at high temperature |
| JP7441249B2 (en) | 2016-05-20 | 2024-02-29 | キョーセラ・エイブイエックス・コンポーネンツ・コーポレーション | multicell ultracapacitor |
| JP7444940B2 (en) | 2016-05-20 | 2024-03-06 | キョーセラ・エイブイエックス・コンポーネンツ・コーポレーション | Ultracapacitors used at high temperatures |
| JP2022552587A (en) * | 2019-10-18 | 2022-12-19 | エルジー エナジー ソリューション リミテッド | Secondary batteries and devices containing them |
| JP7387966B2 (en) | 2019-10-18 | 2023-11-29 | エルジー エナジー ソリューション リミテッド | Secondary batteries and devices containing them |
| CN113972448A (en) * | 2021-10-19 | 2022-01-25 | 东莞新能安科技有限公司 | Electrochemical device and electronic device comprising same |
| CN113972448B (en) * | 2021-10-19 | 2022-08-09 | 东莞新能安科技有限公司 | Electrochemical device and electronic device comprising same |
| JP7315916B1 (en) | 2023-03-20 | 2023-07-27 | アポロ工業株式会社 | Lead terminal manufacturing method and lead terminal |
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