JP2000150306A - Current collecting system of battery or capacitor - Google Patents

Current collecting system of battery or capacitor

Info

Publication number
JP2000150306A
JP2000150306A JP10322406A JP32240698A JP2000150306A JP 2000150306 A JP2000150306 A JP 2000150306A JP 10322406 A JP10322406 A JP 10322406A JP 32240698 A JP32240698 A JP 32240698A JP 2000150306 A JP2000150306 A JP 2000150306A
Authority
JP
Japan
Prior art keywords
current collecting
electrode
current
battery
negative electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10322406A
Other languages
Japanese (ja)
Inventor
Kazuyuki Toki
和幸 土岐
Original Assignee
Toyota Motor Corp
トヨタ自動車株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Motor Corp, トヨタ自動車株式会社 filed Critical Toyota Motor Corp
Priority to JP10322406A priority Critical patent/JP2000150306A/en
Publication of JP2000150306A publication Critical patent/JP2000150306A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

PROBLEM TO BE SOLVED: To realize a current collecting system which enables simply and quickly current collecting process from an electrode to an outer terminal in a battery or a capacitor. SOLUTION: This current collecting system of a battery or a capacitor is equipped with an electrode body 10 in which a positive pole and a negative pole wherein active material layers are formed on current collecting foil surfaces are laminated via a separator. The electrode body 10 has current collecting foil laminated parts 12, (13) where only the part of a current collecting foil where active material of the positive pole or the negative pole is not formed is laminated in either of the laminated end portions. Further, the electrode 10 has a clamping current collecting member 50 for damping the current collecting foil laminated parts 12, (13), and an outer terminal 80 electrically connected with the current collecting member 50.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【0001】[0001]
【発明の属する技術分野】本発明は、電池またはキャパ
シタの電極から外部端子までの集電方式、特に、電池ま
たはキャパシタの組付け作業を容易にすることのできる
集電方式に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current collecting system from an electrode of a battery or a capacitor to an external terminal, and more particularly to a current collecting system capable of easily assembling a battery or a capacitor.
【0002】[0002]
【従来の技術】電子機器の分野では、エネルギー密度の
高いことを理由に、リチウムイオン二次電池等の電池
や、電気二重層の原理を利用したキャパシタが、既に実
用化され広く普及するに至っている。その一方で、環境
問題、資源問題から電気自動車への期待が高まる中、こ
のような高性能な電池、キャパシタを電気自動車用の電
源として用いることが検討されている。
2. Description of the Related Art In the field of electronic equipment, batteries such as lithium ion secondary batteries and capacitors utilizing the principle of an electric double layer have already been put to practical use and spread widely because of their high energy density. I have. On the other hand, while expectations for electric vehicles are increasing due to environmental problems and resource problems, use of such high-performance batteries and capacitors as power sources for electric vehicles is being studied.
【0003】このような電池あるいはキャパシタ(以下
電池等という)は、通常、集電箔と呼ばれる金属箔の表
面に起電反応あるいは蓄電反応の素となる活物質を層状
に形成させて正極および負極をセパレータを介し積層さ
せて電極体とし、この電極体をケースに挿設し、ケース
に設けた外部端子と電極とを導通させることにより構成
されている。電極の積層方式としては2種に大別でき、
その1つは、正極および負極とも数枚〜数十枚を使用
し、この正極および負極を1枚ずつ交互に積み重ねるよ
うに積層するもの(以下単に「積層型」と呼ぶ)であ
り、他の一つは、帯状の長い正極および負極を1枚ずつ
使用し、この正極および負極をロール状にあるいは偏平
ロール状(反物状)に捲回するように積層するもの(以
下「捲回型」と呼ぶ)である。
[0003] Such a battery or a capacitor (hereinafter referred to as a battery or the like) is usually formed by forming an active material serving as an element of an electromotive reaction or a storage reaction on a surface of a metal foil called a collector foil in a layered manner. Are laminated via a separator to form an electrode body, and the electrode body is inserted into a case, and an external terminal provided on the case is electrically connected to the electrode. The electrode lamination method can be roughly classified into two types.
One is to use several to several tens of positive and negative electrodes, and to stack the positive and negative electrodes alternately one by one (hereinafter simply referred to as “lamination type”). One uses a long strip-shaped positive electrode and a long negative electrode one by one, and laminates the positive electrode and the negative electrode so as to be wound in a roll shape or a flat roll shape (cloth shape) (hereinafter referred to as a “winding type”). Call).
【0004】いずれの積層方式の電池等であっても、電
気自動車用の電源等に用いる場合、大容量化しなければ
ならず、そのため電極面積を広く採る必要がある。電極
面積を広くした場合、電池等の通電抵抗を小さくするた
め電極の隅々から集電して外部端子まで接続させなけれ
ばならない。このことから、従来、比較的大型の積層型
の電池等では、例えば、特開平9−298129号公報
に示されるように、積層させた電極のそれぞれに集電用
リードを設け、そのそれらの集電用リードをに外部端子
まとめるように接続するという集電方式を採用していた
(図8参照)。また、捲回型の電池等では、正極および
負極の数箇所に複数の集電用リードを設け、これを捲回
した後、それぞれの極の集電用リードを外部端子にまと
めるという集電方式を採用していた。
[0004] Regardless of the type of laminated battery, when used as a power source for an electric vehicle or the like, the capacity must be increased, and therefore the electrode area needs to be large. When the electrode area is increased, it is necessary to collect current from every corner of the electrode and connect it to an external terminal in order to reduce the current-carrying resistance of a battery or the like. For this reason, conventionally, in a comparatively large laminated battery or the like, for example, as shown in Japanese Patent Application Laid-Open No. 9-298129, a current collecting lead is provided for each of the laminated electrodes, and the current collecting leads are provided. The current collecting method of connecting the power leads to the external terminals was adopted (see FIG. 8). In the case of a wound type battery, a plurality of current collecting leads are provided at several positions of a positive electrode and a negative electrode, and after winding the current collecting leads, the current collecting leads of each electrode are combined into an external terminal. Was adopted.
【0005】集電用リードの電極への付設は、集電箔の
一端に幅広い活物質未形成部を設け、この活物質未形成
部を切欠く等して帯状の集電用リード部を残す方式(図
9(a)参照)、集電箔に間欠的に活物質層を形成する
ことにより活物質層未形成部を設けてこの未形成部に集
電用リードを抵抗溶接等する方式(図9(b)参照)の
ものなどが採用されていた。したがって、集電用リード
をいくつも付設しなければならない大型の電池等では、
このリードの付設作業に必要な手間、工数は多大のもの
となっていた。また、間欠的に活物質層を形成する方式
では、実質的な電極面積の減少となり、効率の面で問題
を抱えていた。
In order to attach the current collecting lead to the electrode, a wide active material non-forming portion is provided at one end of the current collecting foil, and the active material non-forming portion is cut off to leave a band-like current collecting lead portion. A method (see FIG. 9A), a method in which an active material layer is not formed on the current collector foil by forming an active material layer intermittently, and a current collecting lead is resistance-welded to the non-formed portion ( FIG. 9B) was adopted. Therefore, in the case of a large battery that requires a number of current collecting leads,
The labor and man-hours required for the work of attaching the leads have been enormous. Further, in the method of forming the active material layer intermittently, the electrode area is substantially reduced, and there is a problem in terms of efficiency.
【0006】さらに、複数の集電用リードを外部端子に
まとめるように接続する作業は、ボルトナット等による
締結、抵抗溶接、カシメ等によって行うのであるが、こ
の作業は煩雑さを極め、上記集電用リードの付設作業と
相俟って、電池等の作製工数を大幅に増大させ、電池等
のコストを引き上げる要因となっていた。また、同一の
積層端部に正極および負極の集電用リードを付設する場
合は、内部短絡を防止するためのリード付設箇所をそろ
えるといった作業や、それぞれの電極の集電用リードが
触れ合わないように捌くといった作業をも必要とし、集
電処理作業を一層難しいものとさせていた。
Further, the work of connecting a plurality of current collecting leads to the external terminals is performed by fastening with bolts and nuts, resistance welding, caulking, and the like. However, this work is extremely complicated. This, together with the work of attaching the electrical lead, greatly increases the man-hours for manufacturing the battery and the like, which is a factor for raising the cost of the battery and the like. Also, when attaching the current collecting leads for the positive electrode and the negative electrode to the same laminated end portion, work such as arranging the positions where the leads are provided to prevent an internal short circuit, and making sure that the current collecting leads of each electrode do not touch each other. In addition, the work required to handle the current was required, making the current collection processing work more difficult.
【0007】[0007]
【発明が解決しようとする課題】本発明は、電池または
キャパシタ抱える上記問題を解決すべくなされたもので
あり、簡便かつ迅速に電極から外部端子への集電処理を
行うことのできる集電方式を提供することを目的として
いる。
SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problem of a battery or a capacitor, and has a current collecting method capable of easily and quickly collecting current from an electrode to an external terminal. It is intended to provide.
【0008】[0008]
【課題を解決するための手段】本発明の電池またはキャ
パシタの集電方式は、活物質層を集電箔表面に形成した
正極および負極をセパレータを介して積層した電極体を
備えた電池またはキャパシタの集電方式であって、前記
電極体は、いずれかの積層端部に、正極または負極のい
ずれか一方の活物質が形成されていない集電箔の部分の
みが積層されている集電箔積層部を有し、かつ、該集電
箔積層部を挟み付ける挟扼集電部材と、該挟扼集電部材
と導通された外部端子とを有することを特徴とする。
According to the present invention, there is provided a battery or capacitor current collecting system comprising a battery or a capacitor having an electrode body in which an active material layer is formed on the surface of a current collecting foil and a negative electrode is laminated via a separator. Current collecting method, wherein the electrode body is formed by laminating only a part of the current collecting foil on which either the positive electrode or the negative electrode active material is not formed at any one of the laminated ends. It is characterized by having a laminated portion and having a sandwiched current collecting member for sandwiching the current collector foil laminated portion, and an external terminal electrically connected to the sandwiched current collecting member.
【0009】つまり、積層型あるいは捲回型の電池等に
おいて、電極体に正極または負極からの集電用リードを
設けることなく、活物質未形成部を形設した正極または
負極を、この未形成部を他極およびセパレータから突出
させるように積層させ、積層された集電箔からなる電極
を例えば割ピン、クリップ等のような形状をした弾性力
を有する部材で挟み付けることにより集電処理をするも
のである。このような集電処理を行うことで、集電処理
作業は大幅に簡略化されることになる。
That is, in a stacked or wound type battery or the like, a positive electrode or a negative electrode in which an active material-free portion is formed is formed on the electrode body without providing a current collecting lead from the positive electrode or the negative electrode. Part is laminated so as to protrude from the other electrode and the separator, and the electrode formed of the laminated current collector foil is sandwiched between members having an elastic force in the shape of, for example, a cotter pin, a clip, or the like, to perform current collection processing. Is what you do. By performing such a current collection process, the current collection process operation is greatly simplified.
【0010】また、本発明の電池またはキャパシタの集
電方式では、前記挟扼集電部材と前記外部端子とを一体
として形成することもできる。このような構成とすれ
ば、挟扼集電部材と外部端子の間の集電処理をも省略す
ることができ、なお一層の集電処理作業の簡略化が実現
される。
Further, in the battery or capacitor current collecting system of the present invention, the pinched current collecting member and the external terminal may be formed integrally. With such a configuration, it is possible to omit the current collecting process between the pinched current collecting member and the external terminal, and to further simplify the current collecting process.
【0011】[0011]
【発明の実施の形態】本発明の集電方式は、活物質層を
集電箔表面に形成した正極および負極をセパレータを介
して積層した電極体を有し、この電極体がケースに挿設
され、正極または負極からケースに設けた外部端子まで
の集電処理を必要とするものであれば、電池、キャパシ
タを問わずいずれのものにも適用できる。このようなも
のとして、電池では、例えば、リチウムイオン二次電池
等があり、キャパシタとしては活性炭を活物質として用
いた電気二重層キャパシタ等が挙げられる。
BEST MODE FOR CARRYING OUT THE INVENTION The current collecting system of the present invention has an electrode body in which a positive electrode having an active material layer formed on the surface of a current collector foil and a negative electrode are laminated via a separator, and this electrode body is inserted into a case. The present invention can be applied to any battery or capacitor as long as it requires current collection from the positive electrode or the negative electrode to the external terminal provided in the case. Examples of such a battery include a lithium ion secondary battery and the like, and examples of a capacitor include an electric double layer capacitor using activated carbon as an active material.
【0012】本発明の集電方式が適用される電池等の電
極について以下に説明する。例えばリチウムイオン二次
電池の場合、正極は、アルミニウム製等の集電箔表面
に、正極合材を塗工することによって、正極活物質層を
形成させて作製することができる。正極合材は、正極活
物質としてLiCoO2等のリチウム遷移金属複合酸化
物粉末を用い、この正極活物質に、炭素物質粉状体等の
導電助材とポリフッ化ビニリデン等の結着剤を混合して
調製することができる。負極は、正極同様、銅製等の集
電箔表面に、負極合材を塗工することによって、負極活
物質層を形成させて作製することができる。負極合材
は、負極活物質として黒鉛、非晶質炭素等の炭素材料粉
状体を用い、この負極活物質にポリフッ化ビニリデン等
の結着剤を混合することによって調製できる。
An electrode of a battery or the like to which the current collecting method of the present invention is applied will be described below. For example, in the case of a lithium ion secondary battery, the positive electrode can be manufactured by forming a positive electrode active material layer by applying a positive electrode mixture to the surface of a current collector foil made of aluminum or the like. As the positive electrode mixture, a lithium transition metal composite oxide powder such as LiCoO 2 is used as a positive electrode active material, and a conductive material such as a carbon material powder and a binder such as polyvinylidene fluoride are mixed with the positive electrode active material. Can be prepared. The negative electrode can be produced by forming a negative electrode active material layer by applying a negative electrode mixture to the surface of a current collecting foil made of copper or the like, similarly to the positive electrode. The negative electrode mixture can be prepared by using a carbon material powder such as graphite or amorphous carbon as the negative electrode active material and mixing a binder such as polyvinylidene fluoride with the negative electrode active material.
【0013】電気二重層キャパシタの場合は、正極およ
び負極とも同じ構成とすることができ、上記リチウムイ
オン二次電池の場合と同様、アルミニウム製の集電箔表
面に、電極合材を塗工することによって、活物質層を形
成させて作製することができる。電極合材は、活物質と
して活性炭粉末等を使用し、この活物質にポリテトラエ
チレン等を結着剤として混合することによって調整する
ことができる。なお、リチウムイオン二次電池の場合も
電気二重層キャパシタの場合も、電極合材の塗工は、コ
ーター等の塗工機によって行うことができ、塗布乾燥
後、形成された活物質層は密度を高めるべくプレス等に
て圧縮を行うものであってもよい。
In the case of an electric double layer capacitor, the positive electrode and the negative electrode can have the same structure. As in the case of the lithium ion secondary battery, an electrode mixture is applied to the surface of a current collector foil made of aluminum. Thus, the active material layer can be formed and formed. The electrode mixture can be adjusted by using activated carbon powder or the like as an active material and mixing the active material with polytetraethylene or the like as a binder. In the case of both lithium ion secondary batteries and electric double layer capacitors, coating of the electrode mixture can be performed by a coating machine such as a coater. After coating and drying, the formed active material layer has a high density. Compression may be performed by a press or the like in order to increase the pressure.
【0014】正極と負極との間に挟装させるセパレータ
は、正極と負極とを分離し、電解液を保持する役割を担
うもので、ポリプロピレン、ポリエチレン等の微多孔膜
を用いることができる。本発明の集電方式が適用される
電池等では、上記正極および負極を上記セパレータを介
して積層することによって電極体を構成させる。積層方
式には、2種類あり、上述したように、複数枚の正極お
よび負極を交互に幾重にも重ねる積層型と、帯状の正極
および負極を1枚ずつ用い、これを捲回する捲回型であ
る。捲回型には、円筒ロール状に捲回するものと、偏平
ロール状(反物状)に捲回するものとがある。いずれの
ものにも適用でけるが、組電池等を構成した場合に体積
効率が良好であるという点を考慮すれば、偏平ロール状
とすることが望ましい。以下に、本発明の集電方式が適
用される電池等における作製された電極およびこの電極
を積層させた電極体の形状を図を参照しつつ説明する。
The separator sandwiched between the positive electrode and the negative electrode serves to separate the positive electrode and the negative electrode and hold the electrolyte, and a microporous film of polypropylene, polyethylene, or the like can be used. In a battery or the like to which the current collection method of the present invention is applied, an electrode body is configured by laminating the positive electrode and the negative electrode with the separator interposed therebetween. There are two types of lamination methods, as described above, a lamination type in which a plurality of positive electrodes and negative electrodes are alternately stacked in multiple layers, and a winding type in which one strip-shaped positive electrode and one negative electrode are used and wound. It is. The winding type includes a type wound in a cylindrical roll shape and a type wound in a flat roll shape (cloth shape). Although it can be applied to any of them, a flat roll shape is preferable in consideration of good volume efficiency when a battery pack or the like is formed. Hereinafter, the shape of an electrode manufactured in a battery or the like to which the current collection method of the present invention is applied and the shape of an electrode body in which the electrode is stacked will be described with reference to the drawings.
【0015】図1は、積層型の電極体の一実施形態につ
いて示す。電極体10は、正極20と負極30とをセパ
レータ40を介し、交互に幾重にも積層されている。正
極20および負極30は、それぞれ正極集電箔21、負
極集電箔31の両面に正極活物質層22、負極活物質層
32が形成されている。また、正極20および負極30
は、正極活物質層22および負極活物質層32を形成さ
せる際、正極集電箔21および負極集電箔31のそれぞ
れ一端部に活物質層が形成されていない部分を残してい
るため、正極活物質層未形成部23および負極活物質層
未形成部33を有している。正極20および負極30
は、正極活物質層未形成部23および負極活物質層未形
成部33を背向させそれぞれの他極およびセパレータ4
0から突出させるように積層されている。そのため電極
体10は、背向する積層端面部に正極集電箔21または
負極集電箔31のみが積層された、正極集電箔積層部1
2および負極集電箔積層部13を有している。この正極
集電箔積層部12および負極集電箔積層部13が、正極
20および負極30からの集電を行う部分となる。
FIG. 1 shows an embodiment of a laminated electrode assembly. In the electrode body 10, the positive electrode 20 and the negative electrode 30 are alternately stacked with a separator 40 interposed therebetween. In the positive electrode 20 and the negative electrode 30, a positive electrode active material layer 22 and a negative electrode active material layer 32 are formed on both surfaces of a positive electrode current collector foil 21 and a negative electrode current collector foil 31, respectively. Further, the positive electrode 20 and the negative electrode 30
When the positive electrode active material layer 22 and the negative electrode active material layer 32 are formed, a portion where the active material layer is not formed is left at one end of each of the positive electrode current collector foil 21 and the negative electrode current collector foil 31. The active material layer-free portion 23 and the negative electrode active material-layer-free portion 33 are provided. Positive electrode 20 and negative electrode 30
The other electrode and the separator 4 with the positive electrode active material layer non-formed portion 23 and the negative electrode active material layer
The layers are stacked so as to protrude from zero. Therefore, the electrode body 10 has a positive electrode current collector foil laminating portion 1 in which only the positive electrode current collector foil 21 or the negative electrode current collector foil 31 is laminated on the back end face of the laminate.
2 and a negative electrode current collector foil lamination portion 13. The positive electrode current collector foil laminating section 12 and the negative electrode current collector foil laminating section 13 serve as a section for collecting current from the positive electrode 20 and the negative electrode 30.
【0016】図2は、偏平ロール状捲回型の電極体の一
実施形態について示す。電極体10は、帯状の正極20
および負極30の1枚ずつをその間に帯状のセパレータ
を介して捲回することにより、正極20および負極30
が積層された構造となっている。正極20および負極3
0は、それぞれ幅方向の一端部に連続した正極活物質層
未形成部23および負極活物質層未形成部33を有し、
この正極活物質層未形成部23および負極活物質層未形
成部33を背向させそれぞれの他極およびセパレータ4
0から突出させるようにして捲回されている。そのため
電極体10は、背向する積層端面部に正極集電箔21ま
たは負極集電箔31のみが積層された、正極集電箔積層
部12および負極集電箔積層部13を有している。上記
積層型の電極体と同様、この正極集電箔積層部12およ
び負極集電箔積層部13が、正極20および負極30か
らの集電を行う部分となる。
FIG. 2 shows an embodiment of a flat roll-shaped wound electrode body. The electrode body 10 is a strip-shaped positive electrode 20.
The negative electrode 30 and the negative electrode 30 are wound one by one with a band-shaped separator therebetween.
Are laminated. Positive electrode 20 and negative electrode 3
0 has a positive electrode active material layer non-formed portion 23 and a negative electrode active material layer non-formed portion 33 which are respectively continuous to one end in the width direction,
With the positive electrode active material layer non-formed portion 23 and the negative electrode active material layer non-formed portion 33 turned back,
It is wound so as to protrude from zero. Therefore, the electrode body 10 has a positive electrode current collector foil lamination part 12 and a negative electrode current collector foil laminator part 13 in which only the positive electrode current collector foil 21 or the negative electrode current collector foil 31 is laminated on the oppositely facing laminated end face. . As in the case of the above-mentioned laminated electrode body, the positive electrode current collector foil laminating portion 12 and the negative electrode current collector foil laminating portion 13 are portions for collecting current from the positive electrode 20 and the negative electrode 30.
【0017】本発明の集電方式が適用される電池等で
は、上記のように作製された電極体をケースに挿設す
る。ケースは、円筒型、角型等、電極体の形状に合わせ
て種々の形状のものを使用できる。容量の大きな電池等
であって組電池等として使用される場合には、デッドス
ペースが小さく体積効率が良好であることから、角型の
ケースとすることが望ましい。
In a battery or the like to which the current collecting method of the present invention is applied, the electrode body manufactured as described above is inserted into a case. The case may have various shapes such as a cylindrical shape and a square shape according to the shape of the electrode body. When a battery or the like having a large capacity is used as an assembled battery or the like, it is preferable to use a rectangular case because the dead space is small and the volume efficiency is good.
【0018】ケースは、ケース本体とケース蓋とで構成
されるのが一般的で、電極体とともに電解液を注入する
ため、溶接、カシメ等の手段によって密封できる構造で
あることが好ましい。ケース本体およびケース蓋の材質
は、内包する電解液に侵されず、かつ容易に変形等しな
い程度の機械的強度を必要とする。ケースが正極および
負極の端子を兼ねるような場合は、電気化学的に安定で
電解液に溶出しないようなもので作製しなければならな
い。これらの要求を満たすものには、アルミニウムある
いはアルミニウム合金、ニッケルメッキを施した炭素
鋼、ニッケルを多く含むオーステナイト系ステンレス、
樹脂等が挙げられ、ケースはこれらの材質のものから形
成されるのが望ましい。なお金属製の材料を使用して電
池ケースを形成させる場合は、電極体の正極および負極
が内部短絡しないように、インシュレータ等の部品を介
在させることもできる。
The case is generally composed of a case main body and a case lid, and preferably has a structure that can be sealed by welding, caulking, or the like in order to inject the electrolytic solution together with the electrode body. The material of the case body and the case lid needs to have a mechanical strength that is not affected by the electrolyte contained therein and is not easily deformed. When the case also serves as a positive electrode terminal and a negative electrode terminal, it must be made of a material that is electrochemically stable and does not elute into the electrolytic solution. Aluminum or aluminum alloys, nickel-plated carbon steel, nickel-rich austenitic stainless steel,
Resin and the like are mentioned, and the case is desirably formed of those materials. When a battery case is formed using a metal material, components such as an insulator can be interposed so that the positive electrode and the negative electrode of the electrode body are not short-circuited internally.
【0019】電極体とともにケース内に注入される電解
液は、例えば、リチウムイオン二次電池の場合には、プ
ロピレンカーボネート、エチレンカーボネート、ジエチ
ルカーボネート等の1種または2種以上の混合有機溶媒
に、LiPF6、LiBF4等のリチウム塩を溶解させた
非水電解液を用いることができる。また、電気二重層キ
ャパシタの場合は、リチウムイオン二次電池と同様の有
機溶媒に、(C25 4PBF4等のホスホニウム塩等を
溶解させたものを用いることができる。
Electrolysis injected into the case together with the electrode body
For example, in the case of a lithium ion secondary battery,
Ropylene carbonate, ethylene carbonate, diethyl
One or more mixed organic solvents such as carbonate
And LiPF6, LiBFFourDissolved lithium salt
A non-aqueous electrolyte can be used. In addition, electric double layer key
In the case of capacitors, the same as for lithium ion secondary batteries
Solvent (CTwoHFive) FourPBFFourPhosphonium salts, etc.
A dissolved one can be used.
【0020】電極に充電するためあるいは電極から放電
させるために必要な外部端子は、電池ケースに付設され
る。外部端子は、ケースの本体部あるいは蓋部のいずれ
に付設されるものであっていもよい。外部端子は、電池
外部の機器に応じた形状のものとすることができる。外
部端子は、電気伝導性がありかつ電気化学的な反応によ
って電解液に溶出しない材質の材料から形成される必要
があり、これらの要求を満たす材料として、ニッケル、
アルミニウム、リチウムイオン二次電池の負極としての
銅等を用いることができる。なお、金属製のケースに外
部端子を付設するような場合は、正極端子および負極端
子が短絡しないように、インシュレータ等を設けるよう
配慮する必要がある。
External terminals required for charging or discharging the electrodes are attached to the battery case. The external terminal may be attached to either the main body or the lid of the case. The external terminal may have a shape corresponding to a device outside the battery. The external terminal must be formed of a material that is electrically conductive and does not elute into the electrolytic solution due to an electrochemical reaction, and nickel, nickel,
Aluminum or copper as a negative electrode of a lithium ion secondary battery can be used. When an external terminal is attached to a metal case, it is necessary to provide an insulator or the like so that the positive terminal and the negative terminal do not short-circuit.
【0021】本発明の電池またはキャパシタの集電方式
で特徴なす部分は、電極体の積層端部に存在する正極ま
たは負極の集電箔積層部を挟み付けるようにして、正極
または負極から集電する挟扼集電部材にある。自らの弾
性力によって、電極体の集電箔積層部を挟み付ける機能
を果たすこの挟扼集電部材により、集電処理作業は非常
に簡便なものとなる。
The characteristic feature of the current collecting method of the battery or the capacitor of the present invention is that the current collecting foil from the positive electrode or the negative electrode is sandwiched by the current collecting foil laminated portion of the positive electrode or the negative electrode existing at the laminated end of the electrode body. In the current collector. With this sandwiching current collecting member that functions to pinch the current collecting foil laminated portion of the electrode body by its own elastic force, the current collecting process becomes very simple.
【0022】挟扼集電部材は、弾性力を有しかつ電気伝
導性のある材質の材料から形成されることが必要であ
る。また、ケースおよび外部端子と同様電解液に侵され
ないことが重要である。これらの要求を満たすのであれ
ばいかなる材質を用いてもよく、例えば、ニッケル、ニ
ッケル合金、ニッケルリッチのオーステナイト系ステン
レス、アルミニウム、アルミニウム合金、リチウムイオ
ン二次電池の負極側として銅および銅合金等を用いるこ
とができる。
It is necessary that the sandwiched current collecting member is formed of a material having elasticity and electrical conductivity. In addition, it is important that the electrolyte is not affected by the electrolyte as in the case and the external terminals. Any material may be used as long as these requirements are satisfied.For example, nickel, nickel alloy, nickel-rich austenitic stainless steel, aluminum, aluminum alloy, copper and copper alloy as the negative electrode side of the lithium ion secondary battery may be used. Can be used.
【0023】挟扼集電部材の形状は、電極体の集電箔積
層部をしっかりと挟持するものであば、形状を特に限定
するものではない。電極体が偏平ロール状の捲回型であ
る場合、採用できる挟扼集電部材の形状の例を、図3に
示す。図3(a)に示す挟扼集電部材50は、割ピン形
状のもの、つまり帯状の板材をU字状あるいはコの字状
に屈曲させた形状となっている。この形状の挟扼集電部
材は、電極体を図に示す横向きに設置したとき、上方向
あるいは下方向から割ピンに押し込むようにして集電箔
積層部12、(13)を挟扼するものでり、電極体10
の集電箔積層部12、(13)への取付けが非常に容易
に行えるというメリットがある。
The shape of the sandwiched current collecting member is not particularly limited as long as it firmly sandwiches the current collector foil laminated portion of the electrode body. FIG. 3 shows an example of a shape of the sandwiched current collecting member that can be employed when the electrode body is a flat roll-shaped wound type. 3 (a) has a split pin shape, that is, a shape obtained by bending a band-shaped plate material into a U-shape or a U-shape. When the electrode body is installed in the horizontal direction as shown in the figure, the sandwiching current collecting member of this shape sandwiches the current collecting foil laminated portions 12 and (13) by being pushed into the split pin from above or below. Out, electrode body 10
Has an advantage that it can be very easily attached to the current collecting foil laminated portions 12 and (13).
【0024】図3(b)に示すものは、クリップ形状の
もので、集電箔積層部12、(13)を積層端面から幅
広く挟み付けるものである。集電箔積層部12、(1
3)の把持力において上記図3(a)で示すものより優
り、挟扼集電部材50と集電箔積層部12、(13)と
の接触部のいずれの箇所においても強い押圧力を付勢で
きることから、通電の際の接触抵抗を減少させることが
できるというメリットがある。
FIG. 3B shows a clip-shaped one in which the current-collecting foil laminated portions 12 and 13 are sandwiched widely from the laminated end faces. Current collector foil laminating part 12, (1
The gripping force of 3) is superior to that shown in FIG. 3A, and a strong pressing force is applied to any portion of the contact portion between the sandwiched current collecting member 50 and the current collecting foil laminated portions 12 and (13). Power supply, there is an advantage that the contact resistance during energization can be reduced.
【0025】図3(c)に示すものは、変形リング状の
もので、集電箔積層部12、(13)を両側から挟扼し
つつ、上下方向からもある程度の押圧力を付勢すること
のできるものである。集電箔積層部12、(13)と挟
扼集電部材50との接触面を大きくすることができ、接
触に起因する通電抵抗を小さくできるというメリットに
加え、リング形状をしていることで容易に電極体10が
脱落しないというメリットを併せ持つ。
FIG. 3 (c) shows a deformed ring-shaped one which encloses the current collector foil laminations 12 and (13) from both sides and applies a certain amount of pressing force from above and below. It is something that can be done. In addition to the merit that the contact surface between the current collecting foil laminated portions 12 and (13) and the sandwiching current collecting member 50 can be increased, and the current-carrying resistance due to the contact can be reduced, the ring-shaped shape It also has the advantage that the electrode body 10 does not easily fall off.
【0026】図3に示す実施形態では、偏平ロール状捲
回型の電極体ついて示しているが、上記積層型の電極体
であってもこれらの挟扼集電部材を用いて集電処理を行
うことができる。挟扼集電部材50の挟扼する部分の間
隔は、挟み付ける複数の集電箔の厚みの合計より小さい
ものとする必要がある。また、この挟扼部分の間隔は、
付勢することで、挟み付ける複数の集電箔の厚みの合計
より広がるものでなければならない。さらにこの挟扼集
電部材50は、集電箔を挟んだ状態では、自らの弾性力
で、常に、集電箔積層部を積層方向に付勢し続けるもの
でなければならない。したがって、図では明確にしてい
ないが、挟扼集電部材50で挟み付けられた集電箔積層
部12、(13)は、挟み付けられた方向にさらに偏平
し、積層された集電箔は互いに強く密着する。このこと
により、面積の広い電極であっても、電極の隅々から効
率よく集電することができる。
In the embodiment shown in FIG. 3, a flat roll-shaped wound electrode body is shown. However, even in the case of the above-mentioned laminated electrode body, the current collecting process is performed using these sandwiched current collecting members. It can be carried out. It is necessary that the interval between the portions where the sandwiching current collecting member 50 is sandwiched is smaller than the total thickness of the plurality of current collector foils to be sandwiched. In addition, the interval between the pinching portions is
By energizing, it must be wider than the total thickness of the plurality of current collector foils to be sandwiched. Further, when the current collector foil is sandwiched between the current collector foil members 50, the sandwiching current collector member 50 must always urge the current collector foil laminate portion in the stacking direction by its own elastic force. Therefore, although not clearly shown in the figure, the current collector foil laminated portions 12 and (13) sandwiched by the sandwiching current collector 50 are further flattened in the sandwiching direction, and the stacked current collector foils Strongly adhere to each other. Thus, even if the electrode has a large area, current can be efficiently collected from every corner of the electrode.
【0027】なお、挟扼集電部材50で挟み付ける前
に、集電箔積層部12(13)を、抵抗溶接、超音波接
合、端面に施すレーザー溶接等の手段によって、一体的
に接合することもできる。集電箔積層部を一体として接
合することにより、電極からの集電において発生する接
触抵抗に起因する通電抵抗の上昇を防止することがで
き、より抵抗の小さい集電処理を担保することができ
る。
Before being sandwiched by the sandwiching current collecting member 50, the current collecting foil laminated portions 12 (13) are integrally joined by means such as resistance welding, ultrasonic welding, or laser welding applied to the end face. You can also. By integrally joining the current-collecting foil laminated portions, it is possible to prevent an increase in current-carrying resistance due to contact resistance generated in current collection from the electrodes, and to ensure current-collecting processing with lower resistance. .
【0028】正極および負極とも、このような挟扼集電
部材を用いて集電処理した場合であって、ケースに金属
材料を用いることにより正極側と負極側とが内部短絡を
する危険性のある場合は、挟扼集電部材のケースと接触
する部分を電気的に絶縁する被覆を施したり、ケース内
壁面にインシュレータを設ける等することが望ましい。
Both the positive electrode and the negative electrode have been subjected to current collection processing using such a sandwiched current collecting member. When a metal material is used for the case, there is a danger of an internal short circuit between the positive electrode side and the negative electrode side. In some cases, it is desirable to provide a coating that electrically insulates a portion of the sandwiched current collecting member that contacts the case, or to provide an insulator on the inner wall surface of the case.
【0029】挟扼集電部材と外部端子との接続は、正極
側負極側とも1本のリード線等を用いて行うことができ
る。このことにより、従来、比較的容量の大きな電池等
で問題となっていた複数の集電リードを捌いて外部端子
に接続するといった煩雑な作業がなくなり、集電処理時
間の大幅な短縮が可能となる。接続は、カシメ、抵抗溶
接等通常の手段によって行うことができる。
The connection between the sandwiched current collecting member and the external terminal can be made using one lead wire on both the positive and negative electrode sides. This eliminates the cumbersome task of handling multiple current collection leads and connecting them to external terminals, which has conventionally been a problem with relatively large-capacity batteries, etc., and can significantly reduce the current collection processing time. Become. Connection can be made by ordinary means such as caulking or resistance welding.
【0030】また、本発明の集電方式では、挟扼集電部
材と外部端子を一体として形成した集電端子部材を用い
ることも有効である。このような2つの機能を果たす部
材を用いることにより、挟扼集電部材と外部端子との接
続が省略され、さらなる集電処理の迅速化が実現でき
る。以上、本発明の電池またはキャパシタの集電方式に
実施形態について説明したが、本発明の実施形態はこの
形態のみに限定されるものではない。例えば、上記実施
形態では、正極側および負極側とも本発明の集電方式を
採用するものであるが、正極側のみあるいは負極側のみ
本発明の集電方式を採用し、他極側は従来からの集電方
式を採用するものであっても構わない。また、積層型の
電極体を採用する場合、正極側と負極側を背向する積層
端部で集電処理を行う態様に代え、隣り合う積層端部で
集電処理を行う態様を採用することもできる。また、集
電処理に多少に時間はかかるが、積層させた場合に正極
および負極の集電箔積層部が接しないように活物質未形
成部を切り欠く等の処理を施し、電極体の同じ積層端部
にて、挟扼集電部材を用いて、両極の集電処理を行うこ
とも可能である。
In the current collecting system of the present invention, it is also effective to use a current collecting terminal member in which the sandwiched current collecting member and the external terminal are integrally formed. By using a member that fulfills these two functions, the connection between the sandwiched current collecting member and the external terminal is omitted, and the speed of the current collecting process can be further increased. As described above, the embodiment has been described with respect to the current collecting method of the battery or the capacitor of the present invention, but the embodiment of the present invention is not limited to this mode alone. For example, in the above embodiment, the current collecting method of the present invention is adopted on both the positive electrode side and the negative electrode side, but the current collecting method of the present invention is adopted only on the positive electrode side or only on the negative electrode side, and the other electrode side is conventionally used. May be adopted. In the case of employing a stacked electrode body, instead of performing the current collecting process at the stacked end portion facing the positive electrode side and the negative electrode side, a mode of performing the current collecting process at the adjacent stacked end portion is adopted. Can also. In addition, although it takes some time for the current collecting process, when the layers are laminated, the active material non-formed portion is cut out so that the current collecting foil laminated portions of the positive electrode and the negative electrode do not come into contact with each other, and the same process is performed for the electrode body. It is also possible to perform a current collection process on both electrodes at the end of the lamination using a sandwiched current collecting member.
【0031】[0031]
【実施例】上記実施形態に基づいて、偏平ロール状の捲
回型電極体を有するキャパシタについて採用する本発明
の集電方式の実施例を、図を参照しつつさらに詳しく説
明する。ただし、以下の実施例は本発明の集電方式の一
例に過ぎず、本発明の集電方式は、上記実施形態に基づ
く種々の態様のものとすることができる。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a current collecting system according to the present invention which is adopted for a capacitor having a flat roll-shaped wound electrode body based on the above embodiment will be described in more detail with reference to the drawings. However, the following examples are merely examples of the current collecting method of the present invention, and the current collecting method of the present invention may be various modes based on the above-described embodiments.
【0032】〈実施例1〉本実施例は、割りピン状の挟
扼集電部材と外部端子とを一体に形成した集電端子部材
を用いた集電方式の例である。本実施例の集電方式の概
略を図4に示す。本実施例のキャパシタの電極体10を
構成する正極および負極は、同じ構成のものであり、活
物質に活性炭を用い、この活物質に結着剤としてメチル
セルロースを混合した電極合材を厚さ15μmのアルミ
ニウム製集電箔の両面に塗工して、正極では片面あたり
70μm、負極では片面あたり40μmの厚さの活物質
層を形成させて作製したものである。電極の大きさは幅
80mm、長さ5000mmの帯状のものとした。活物
質層未形成部は幅15mmで、電極の幅方向の一端部に
全長にわたって形設されている。
<Embodiment 1> This embodiment is an example of a power collection system using a current collection terminal member in which a split pin-shaped pinched current collection member and an external terminal are integrally formed. FIG. 4 shows an outline of the power collection system of this embodiment. The positive electrode and the negative electrode constituting the electrode body 10 of the capacitor of the present embodiment have the same configuration. The active material is activated carbon, and the active material is mixed with methylcellulose as a binder. This was prepared by coating on both sides of the aluminum current collector foil described above to form an active material layer having a thickness of 70 μm per side for the positive electrode and 40 μm per side for the negative electrode. The size of the electrode was a strip having a width of 80 mm and a length of 5000 mm. The portion where the active material layer is not formed has a width of 15 mm, and is formed over the entire length at one end in the width direction of the electrode.
【0033】電極体10は、この正極および負極を、厚
さ50μmのアルミ電解コンデンサ用セパレータを介し
て捲回することによって積層して形成されている。正極
および負極のそれぞれの活物質層未塗工部を他極および
セパレータより幅方向に突出させて捲回していることか
ら、電極体10は、背向する積層端部が集電箔のみが積
層されて形成されている正極集電箔積層部12および負
極集電箔積層部13となっている。ちなみに、電極体1
0の大きさは、積層端面が約20mm×約75mmで、
長さは110mmとなっている。なお正極集電箔積層部
12および負極集電箔積層部13の幅は、活物質層未形
成部幅と同じ15mmである。正極集電箔積層部12お
よび負極集電箔積層部13は、それぞれ3箇所ずつ集電
箔を挟む方向に付勢して抵抗溶接されている(溶接箇所
は図の14)。
The electrode body 10 is formed by laminating the positive electrode and the negative electrode through a 50 μm-thick aluminum electrolytic capacitor separator. Since the active material layer uncoated portion of each of the positive electrode and the negative electrode is wound so as to protrude in the width direction from the other electrode and the separator, the electrode body 10 has only the current collecting foil laminated at the back end of the electrode body 10. Thus, a positive electrode current collector foil laminated portion 12 and a negative electrode current collector foil laminated portion 13 are formed. By the way, electrode body 1
The size of 0 is that the laminated end face is about 20 mm x about 75 mm,
The length is 110 mm. In addition, the width of the positive electrode current collector foil laminated portion 12 and the negative electrode current collector foil laminated portion 13 is 15 mm, which is the same as the width of the portion where the active material layer is not formed. The positive electrode current collector foil laminating portion 12 and the negative electrode current collector foil laminating portion 13 are each resistance-welded by biasing the current collector foil in three directions each at three locations (welding portions are shown in FIG. 14).
【0034】電極体が挿設されるケース70は、ケース
本体71とケース蓋72とからなり、図では明確にして
いないが、ケース本体71の開口部にケース蓋72を被
せ、カスケットを介してカシメることにより密閉される
構造となっている。ケース本体71は、厚さ0.6mm
のアルミニウム製で、その内のりは、電極体10より若
干大きい113mm×85mm×25mmのものとなっ
ている。なお、電極体10とケース本体71との絶縁を
考慮し、ケース本体71の内面を絶縁フィルム等で被覆
するものであってもよい。また、ケース蓋72は、厚さ
1mmのフェノール系樹脂製で、両端部に集電端子部材
60が付設されるための端子付設孔74が形設され、中
央部に電解液を注入するための電解液注入孔73が形設
されている。
The case 70 in which the electrode body is inserted is composed of a case main body 71 and a case lid 72. Although not shown in the drawing, the case lid 72 is placed over the opening of the case main body 71, and a casing is inserted through a casing. The structure is sealed by caulking. Case body 71 is 0.6 mm thick
And the inner diameter is 113 mm × 85 mm × 25 mm slightly larger than the electrode body 10. In consideration of insulation between the electrode body 10 and the case body 71, the inner surface of the case body 71 may be covered with an insulating film or the like. The case lid 72 is made of a phenolic resin having a thickness of 1 mm, and has a terminal mounting hole 74 for mounting the current collecting terminal member 60 at both ends, and a case for injecting an electrolyte into the center. An electrolyte injection hole 73 is formed.
【0035】集電端子部材60は、電極体10の正極集
電箔積層部12または負極集電箔積層部13を挟扼して
集電する挟扼集電部材50と外部端子80とがスッポト
溶接によって接合され、一体として形成されている。挟
扼集電部61は、厚さ1mm、幅5mmのステンレス製
の帯状のものを折り曲げることによって形成されてい
る。また、外部端子はステンレス製で、外径5mmφ、
長さ10mmの円筒状のものとなっている。
The current collecting terminal member 60 is formed of a sandwiched current collecting member 50 for sandwiching the positive electrode current collecting foil laminated portion 12 or the negative electrode current collecting foil laminated portion 13 of the electrode body 10 to collect current and the external terminal 80. They are joined by welding and are formed integrally. The sandwiching current collector 61 is formed by bending a stainless steel strip having a thickness of 1 mm and a width of 5 mm. The external terminals are made of stainless steel and have an outer diameter of 5 mmφ,
It has a cylindrical shape with a length of 10 mm.
【0036】キャパシタの組付けは、以下のようにして
行う。まず2つの集電端子部材60を、ケース蓋72の
端子付設孔74に、図の下方からガスケット75ととも
に挿入して取付け、ケース蓋72と集電端子部材60と
を一体化させる。次いで正極集電箔積層部12および負
極集電箔積層部13が抵抗溶接された電極体10を、図
の下方より、2つの挟扼集電部材50に正極集電箔積層
部12および負極集電箔積層部13を挟み込むように把
持させる。次に、ケース蓋72と電極体10とが一体と
なったものを、ケース本体71に挿設し、ケース本体7
1の上部をケース蓋72とともにカシメる。最後に、電
解液注入孔73より電解液を注入し、電解液を電極体に
含浸させた後に、図には示していないキャップにて電解
液注入孔を封口して、キャパシタを完成させる。なお、
使用する電解液は、溶媒としてプロピレンカーボネート
を用い、これに電解質として(C254NBF4を溶解
させたものである。 上記のように、非常に迅速かつ簡
便な方法によって集電処理作業を完了させることができ
るため、本実施例の集電方式を採用するキャパシタは、
製造コストの面で非常に有利なキャパシタとなる。
The assembly of the capacitor is performed as follows. First, the two current collecting terminal members 60 are inserted into the terminal mounting holes 74 of the case lid 72 together with the gasket 75 from below in the figure, and attached, so that the case lid 72 and the current collecting terminal members 60 are integrated. Next, the electrode body 10 to which the positive electrode current collector foil laminate section 12 and the negative electrode current collector foil laminate section 13 are resistance-welded is attached to two sandwiching current collector members 50 from below in the drawing. The electro-foil laminated portion 13 is gripped so as to sandwich it. Next, the one in which the case lid 72 and the electrode body 10 are integrated is inserted into the case body 71, and the case body 7
1 is caulked together with the case lid 72. Finally, an electrolyte is injected from the electrolyte injection hole 73 to impregnate the electrode body with the electrolyte, and then the electrolyte injection hole is sealed with a cap (not shown) to complete the capacitor. In addition,
The electrolytic solution used is a solution obtained by using propylene carbonate as a solvent and dissolving (C 2 H 5 ) 4 NBF 4 as an electrolyte therein. As described above, since the current collection processing operation can be completed by a very quick and simple method, the capacitor adopting the current collection method of this embodiment is
This is a very advantageous capacitor in terms of manufacturing cost.
【0037】〈実施例2〉本実施例は、上記実施例1を
改良したものである。図5に、本実施例の集電方式につ
いて、キャパシタの断面として表す。本実施例では、挟
扼集電部材50に、挟扼する部分の先端をU字状に折返
して拘止部51を設けたことを特徴としている。この拘
止部51は、電極体10とケース本体71の内壁の両方
に接し、拘止部51の有する弾性力で、電極体10の集
電箔積層部12(13)の挟扼をさらに強いものとして
いる。このことにより、集電箔積層部12(13)と挟
扼集電部材50との接触による通電抵抗の減少が図れる
とともに、ケース本体71内での電極体10の搖動が拘
束されることになる。
<Embodiment 2> This embodiment is an improvement of Embodiment 1 described above. FIG. 5 shows the current collecting method of the present embodiment as a cross section of a capacitor. The present embodiment is characterized in that the engaging portion 51 is provided on the sandwiching current collecting member 50 by folding the tip of the portion to be sandwiched into a U-shape. The restraining portion 51 is in contact with both the electrode body 10 and the inner wall of the case main body 71, and the elastic force of the restraining portion 51 further strengthens the current collector foil laminated portion 12 (13) of the electrode body 10 from being caught. It is assumed. As a result, the current-carrying resistance due to the contact between the current-collecting foil laminated portion 12 (13) and the sandwiched current-collecting member 50 can be reduced, and the swing of the electrode body 10 in the case main body 71 is restrained. .
【0038】なお、ケース本体71が、導電性材料から
なるときは、拘止部51とケース本体71の内壁との接
触部を絶縁する必要がある。絶縁の方法は、拘止部50
を被覆するものでもよく、ケース本体71の接触部を被
覆するものでもよい。上述したように、ケース本体71
の内面を絶縁フィルムにて被覆するのが簡便な方法とな
る。
When the case main body 71 is made of a conductive material, it is necessary to insulate the contact portion between the locking portion 51 and the inner wall of the case main body 71. The method of insulation is as follows:
Or may cover the contact portion of the case body 71. As described above, the case body 71
It is a simple method to cover the inner surface with an insulating film.
【0039】図6は、ケース本体71側の接触部に、樹
脂製の突状片76を設けた実施態様であり、このような
突状片76を設けることにより、挟扼集電部材50とケ
ース本体71の絶縁が担保されるとともに、電極体10
の拘止をより確実なものとすることができる。なお、樹
脂製の突状片76に代えて、ケース本体71の内面が絶
縁フィルム等で被覆されている場合には、ケース本体7
1の外部側からプレス等の手段により、この突状片76
と同じ位置に同様の形状の突起をケース本体71の内面
に設けることも可能である。
FIG. 6 shows an embodiment in which a projecting piece 76 made of resin is provided at the contact portion on the case body 71 side. The insulation of the case body 71 is ensured, and the electrode body 10
Can be more securely detained. When the inner surface of the case body 71 is covered with an insulating film or the like instead of the resin projecting piece 76, the case body 7
1 by means such as a press from outside.
It is also possible to provide a projection of the same shape at the same position on the inner surface of the case body 71.
【0040】〈実施例3〉本実施例は、上記実施例1お
よび2と電極体等の構成を同じとし、挟扼集電部材と外
部端子とを一体に形成していない点で異なる実施例とな
っている。本実施例の集電方式を図7に示す。本実施例
の集電方式では、電極体10の集電箔積層部12(1
3)を挟扼する挟扼集電部材50と、外部端子80と、
これらを接続するための1本のリード90を用いてい
る。挟扼集電部材50と外部端子80は実施例1のもの
と同じ材質の材料から形成されており、リード90も、
これらと同じステンレス製のもので、厚さ1mm、幅5
mmの短冊状のものとなっている。リード90の接合
は、その方法を限定するものではないが、本実施例のも
のは、抵抗溶接によって行っている。このように、挟扼
集電部材50と外部端子80を分離したものは、集電処
理作業に若干の時間を必要とするが、電極体10の大き
さ等によって外部端子80のケースへの付設位置が制限
されることがないとう利点を有する。
<Embodiment 3> This embodiment is different from Embodiments 1 and 2 in that the configuration of the electrode body and the like is the same, and that the sandwiching current collecting member and the external terminal are not integrally formed. It has become. FIG. 7 shows a current collection method according to this embodiment. In the current collecting method of the present embodiment, the current collecting foil laminated portion 12 (1
3) a current-collecting member 50 for pinching, an external terminal 80,
One lead 90 for connecting these is used. The clamped current collecting member 50 and the external terminal 80 are formed of the same material as that of the first embodiment.
These are made of the same stainless steel and have a thickness of 1 mm and a width of 5 mm.
mm. The method of joining the leads 90 is not limited, but in this embodiment, the joining is performed by resistance welding. As described above, when the current collecting member 50 and the external terminal 80 are separated from each other, it takes some time for the current collecting process. However, depending on the size of the electrode body 10, the external terminal 80 is attached to the case. This has the advantage that the position is not restricted.
【0041】なお、本実施例では、集電箔の積層端面側
から挟み付ける形式の挟扼集電部材50を用いて、しか
も捲回中心から片側だけにある集電箔を挟み付けること
によって集電処理を行っている。このように本発明の集
電方式では、必ずしも集電箔全体を挟み付ける必要はな
く、本実施例では、集電箔積層部12(13)を接合す
ることはできないが、挟扼集電部材50自体が小型化、
軽量化できるというメリットを有する。
In the present embodiment, the current collecting foil is sandwiched from the lamination end face side of the current collecting foil by using a sandwiching current collecting member 50, and the current collecting foil is sandwiched only on one side from the winding center. Electric treatment is being performed. As described above, in the current collecting method of the present invention, it is not always necessary to sandwich the entire current collecting foil, and in this embodiment, the current collecting foil laminated portions 12 (13) cannot be joined, 50 itself is downsized,
It has the advantage of being lighter.
【0042】[0042]
【発明の効果】本発明の電池またはキャパシタの集電方
式は、電極体の集電箔積層部を挟み付けることのできる
挟扼集電部材を用いて集電処理するように構成されてい
る。このように構成することにより、本発明の集電方式
を採用する電池またはキャパシタは、集電処理を簡便か
つ迅速に行うことができ、組付けに要する作業時間を減
少させることで、コスト面で非常に有利なものとなる。
The current collecting method for a battery or a capacitor according to the present invention is configured so that a current collecting process is performed using a sandwiched current collecting member capable of sandwiching a current collecting foil laminated portion of an electrode body. With such a configuration, the battery or the capacitor adopting the current collecting method of the present invention can perform the current collecting process simply and quickly, and reduce the work time required for assembly, thereby reducing the cost. It will be very advantageous.
【図面の簡単な説明】[Brief description of the drawings]
【図1】 本発明の集電方式を採用できる積層型電極体
の構成を示す。
FIG. 1 shows a configuration of a laminated electrode body that can employ a current collecting method of the present invention.
【図2】 本発明の集電方式を採用できる偏平ロール状
の捲回型電極体の構成を示す。
FIG. 2 shows a configuration of a flat roll-shaped wound electrode body to which the current collecting method of the present invention can be applied.
【図3】 本発明の集電方式において用いることのでき
る挟扼集電部材の形状を例示する。
FIG. 3 illustrates a shape of a pinched current collector that can be used in the current collection system of the present invention.
【図4】 割りピン状の挟扼集電部材と外部端子とを一
体に形成した集電端子部材を用いた本発明の集電方式の
実施例を示す。
FIG. 4 shows an embodiment of the current collecting system of the present invention using a current collecting terminal member in which a split-pin-shaped pinched current collecting member and an external terminal are integrally formed.
【図5】 挟扼集電部材に拘止部を設けるように改良し
た本発明の集電方式の実施例を示す。
FIG. 5 shows an embodiment of the current collecting system of the present invention in which a pinched current collecting member is provided with a retaining portion.
【図6】 ケース本体内壁に突状片を設け、これに挟扼
集電部材の拘止部を当接させる本発明の集電方式の実施
例を示す。
FIG. 6 shows an embodiment of the current collecting system of the present invention in which a protruding piece is provided on the inner wall of the case main body, and a retaining portion of the sandwiched current collecting member is brought into contact with the projecting piece.
【図7】 挟扼集電部材と外部端子が分離されている本
発明の集電方式の実施例を示す。
FIG. 7 shows an embodiment of the current collecting system of the present invention in which a sandwiched current collecting member and an external terminal are separated.
【図8】 積層型の電極体をもつ電池の、従来の集電方
式を示す。
FIG. 8 shows a conventional current collecting method of a battery having a stacked electrode body.
【図9】 従来の電池またはキャパシタにおける集電用
リードの付設方式を示す。
FIG. 9 shows a method of attaching current collecting leads in a conventional battery or capacitor.
【符号の説明】[Explanation of symbols]
10:電極体 12:正極集電箔積層部 13:負極集電箔積層部 14:抵抗溶接箇所 15:集電用リード 20:正極 21:正極集電箔 22:正極活物質層 23:正極活物質層未形成部 30:負極 31:負極集電箔 32:負極活物質層 33:負極活物質層未形成部 40:セパレータ 50:挟扼集電部材 51:拘止部 60:集電端子部材 70:ケース 71:ケース本体 72:ケース蓋 73:電解液注入孔 74:端子付設孔 75:ガスケット 76:突状片 80:外部端子 90:リード 10: Electrode body 12: Positive electrode current collector foil laminate 13: Negative electrode current collector foil laminate 14: Resistance welding spot 15: Current collecting lead 20: Positive electrode 21: Positive electrode current collector foil 22: Positive electrode active material layer 23: Positive electrode active Material layer non-formed portion 30: Negative electrode 31: Negative electrode current collector foil 32: Negative electrode active material layer 33: Negative electrode active material layer non-formed portion 40: Separator 50: Nipping current collecting member 51: Locking portion 60: Current collecting terminal member 70: Case 71: Case body 72: Case lid 73: Electrolyte injection hole 74: Terminal attachment hole 75: Gasket 76: Projection piece 80: External terminal 90: Lead

Claims (2)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 活物質層を集電箔表面に形成した正極お
    よび負極をセパレータを介して積層した電極体を備えた
    電池またはキャパシタの集電方式であって、 前記電極体は、いずれかの積層端部に、正極または負極
    のいずれか一方の活物質が形成されていない集電箔の部
    分のみが積層されている集電箔積層部を有し、 かつ、該集電箔積層部を挟み付ける挟扼集電部材と、 該挟扼集電部材と導通された外部端子とを有することを
    特徴とする電池またはキャパシタの集電方式。
    1. A current collecting system for a battery or a capacitor including an electrode body in which an active material layer is formed on a surface of a current collector foil and a positive electrode and a negative electrode are laminated with a separator interposed therebetween. At the lamination end, there is a current collecting foil laminated portion in which only a portion of the current collecting foil on which either the positive electrode or the negative electrode active material is not formed is laminated, and the current collecting foil laminated portion is sandwiched. A current collecting method for a battery or a capacitor, comprising: a current collecting member to be attached; and an external terminal electrically connected to the current collecting member.
  2. 【請求項2】 前記挟扼集電部材と前記外部端子が一体
    として形成されている請求項1に記載の電池またはキャ
    パシタの集電方式。
    2. The current collecting method for a battery or a capacitor according to claim 1, wherein the sandwiched current collecting member and the external terminal are integrally formed.
JP10322406A 1998-11-12 1998-11-12 Current collecting system of battery or capacitor Pending JP2000150306A (en)

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