JP2002075457A - Cell - Google Patents
CellInfo
- Publication number
- JP2002075457A JP2002075457A JP2000263521A JP2000263521A JP2002075457A JP 2002075457 A JP2002075457 A JP 2002075457A JP 2000263521 A JP2000263521 A JP 2000263521A JP 2000263521 A JP2000263521 A JP 2000263521A JP 2002075457 A JP2002075457 A JP 2002075457A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- positive electrode
- sealing lid
- current collector
- positive pole
- 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
Landscapes
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、リチウムイオン電
池等の電池に関し、特に電池外装缶または封口蓋の内面
と正極集電体との接合に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery such as a lithium ion battery, and more particularly, to a joining between an inner surface of a battery outer can or a sealing lid and a positive electrode current collector.
【０００２】[0002]
【従来の技術】正極にコバルト酸リチウム等のリチウム
含有複合酸化物を用い、負極にリチウムイオンを吸蔵放
出できる炭素材料を用いたリチウムイオン電池は、高電
圧、高エネルギー密度といった特徴を有し広く利用され
ている。この電池の形状としては、コイン形（ボタン
形）、円筒形あるいは角形が多い。2. Description of the Related Art A lithium ion battery using a lithium-containing composite oxide such as lithium cobalt oxide for a positive electrode and a carbon material capable of inserting and extracting lithium ions for a negative electrode has characteristics such as high voltage and high energy density. It's being used. As the shape of this battery, there are many coin shapes (button shapes), cylindrical shapes or square shapes.
【０００３】コイン形の電池は、一般に、円板状の正極
と負極とがセパレータを介して対向してなる電極体を内
部に収容したステンレス製の正極缶と負極封口蓋とを、
絶縁ガスケットを介して、かしめ固定した構造をしてい
る。そして、上記正極と負極はそれぞれステンレス製集
電体を介して、正極缶と負極封口蓋に電気的に接続して
いる。この場合、正極缶等と集電体は、電気的な接続を
確実なものにするため、通常、製造効率やコスト面で有
利なスポット溶接で接合する。A coin-shaped battery generally includes a stainless steel positive electrode can containing a disk-shaped positive electrode and a negative electrode opposed to each other with a separator therebetween, and a negative electrode sealing lid.
The structure is caulked and fixed via an insulating gasket. The positive electrode and the negative electrode are electrically connected to a positive electrode can and a negative electrode sealing lid via a stainless steel current collector, respectively. In this case, the positive electrode can or the like and the current collector are usually joined by spot welding, which is advantageous in terms of manufacturing efficiency and cost, in order to secure electrical connection.
【０００４】ところで、リチウムイオン電池は、充電時
の電池電圧が４Ｖ以上の高電圧になるものである。この
ため、一般的なコイン形電池のように正極缶や集電体に
ステンレスを用いると、ステンレスは４Ｖ以上の高電圧
で腐食（鉄が溶出）してしまうので、高い電池性能を備
えた電池を構成できない。[0004] Lithium-ion batteries have a high battery voltage of 4 V or more during charging. For this reason, when stainless steel is used for the positive electrode can and the current collector as in a general coin-type battery, the stainless steel is corroded (iron is eluted) at a high voltage of 4 V or more, so that a battery with high battery performance is provided. Cannot be configured.
【０００５】そこで、正極缶や集電体の形成材料とし
て、ステンレスよりも耐食性に優れたアルミニウムを用
いることが検討されている。Therefore, the use of aluminum, which has better corrosion resistance than stainless steel, as a material for forming a positive electrode can or a current collector has been studied.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、アルミ
ニウムは、電気抵抗率が低く、熱伝導性が高いため、ア
ルミニウム製正極缶とアルミニウム製集電体をスポット
溶接で接合した場合、充分な接合強度で接合しないとい
う問題がある。接合強度が充分でないと、電池の使用中
に正極缶と集電体の接合が外れて電気的接続が悪くな
り、電池の容量が取り出せないという重大なトラブルを
引き起こす。However, aluminum has a low electric resistivity and a high thermal conductivity. Therefore, when an aluminum positive electrode can and an aluminum current collector are joined by spot welding, they have sufficient joining strength. There is a problem of not joining. If the bonding strength is not sufficient, the connection between the positive electrode can and the current collector may be disconnected during use of the battery, resulting in poor electrical connection, causing a serious trouble that the battery capacity cannot be taken out.
【０００７】本発明は、このような事情に鑑みなされた
ものであり、その目的は、電池外装缶、封口蓋、集電体
にアルミニウムを用いたとしても、これらが充分な接合
強度で接合し、その接合が電池使用中に外れることがな
い電池を提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a battery having a sufficient bonding strength even when aluminum is used for a battery outer can, a sealing lid, and a current collector. Another object of the present invention is to provide a battery whose junction does not come off during use.
【０００８】[0008]
【課題を解決するための手段】上記の課題を解決するた
め、請求項１に記載の発明は、正極と負極とをセパレー
タを介して対向させてなる電極体と、前記電極体を収容
する電池外装缶と、前記電池外装缶の開口部を封口する
封口蓋と、前記正極と電気的に接続した正極集電体とを
有し、かつ、前記正極集電体と、前記正極集電体と電気
的に接続される電池外装缶または封口蓋の内面とが、ア
ルミニウムで構成された電池において、前記電池外装缶
または封口蓋の内面と正極集電体とは、導電性接着材に
より接合されていることを特徴とする。According to a first aspect of the present invention, there is provided an electrode body having a positive electrode and a negative electrode opposed to each other with a separator interposed therebetween, and a battery accommodating the electrode body. An outer can, a sealing lid for closing an opening of the battery outer can, and a positive electrode current collector electrically connected to the positive electrode, and the positive electrode current collector and the positive electrode current collector The battery outer can or the inner surface of the sealing lid, which is electrically connected, in a battery made of aluminum, the inner surface of the battery outer can or the sealing lid and the positive electrode current collector are joined by a conductive adhesive. It is characterized by being.
【０００９】上記の構成によれば、接合部分がともにア
ルミニウムである電池外装缶または封口蓋と集電体とが
導電性接着材の接着力によって接合されているので、ス
ポット溶接で接合した場合に比べ、強固に接合したもの
となる。よって、電池の使用中に両者の接合が外れて、
電池容量が取り出せないといった事態を招くこともな
い。[0009] According to the above configuration, since the battery outer can or sealing lid and the current collector, both of which are jointed with aluminum, are joined by the adhesive force of the conductive adhesive, the joint is formed by spot welding. In comparison, it is a firmly joined one. Therefore, during use of the battery, the two parts come off,
There is no possibility that the battery capacity cannot be taken out.
【００１０】また、導電性接着材による接合は、スポッ
ト溶接で接合する場合に比べ、低い温度で行えるので、
電池の各部材が熱損傷等を受けるおそれがない。さら
に、導電性接着材自体が導電性を有しているので、この
接着材による接合によって電気的接続が不充分になるこ
ともない。そして、電池外装缶または封口蓋にはアルミ
ニウムを用いるので、電池重量の増大を招かず、単位重
量当たりのエネルギー密度を大きく損なうこともない。
また、導電性接着材を電池外装缶または封口蓋と集電体
との間に形成すればよいので、生産性や低コスト性の面
で大幅に不利になることもない。[0010] In addition, since joining with a conductive adhesive can be performed at a lower temperature than joining with spot welding,
There is no possibility that each member of the battery is subject to thermal damage or the like. Further, since the conductive adhesive itself has conductivity, electrical connection does not become insufficient due to the joining by the adhesive. Further, since aluminum is used for the battery outer can or the sealing lid, the battery weight does not increase and the energy density per unit weight does not significantly deteriorate.
Further, since the conductive adhesive may be formed between the battery outer can or the sealing lid and the current collector, there is no significant disadvantage in terms of productivity and low cost.
【００１１】なお、本発明において、アルミニウムと
は、金属アルミニウムの他、アルミニウム合金をも含む
概念で用いている。よって、特に示さない限り、アルミ
ニウムといえば、金属アルミニウムとアルミニウム合金
の双方を含む。In the present invention, aluminum is used as a concept including not only metallic aluminum but also aluminum alloy. Thus, unless otherwise indicated, aluminum includes both metallic aluminum and aluminum alloys.
【００１２】また、電池外装缶とは、片端開口部を有す
る有底状のものであって、この外装缶自体が電池から外
部への電流取り出し端子になるものをいい、封口蓋と
は、上記電池外装缶の開口部を封口するものであって、
この封口蓋自体が電池から外部への電流取り出し端子に
なるものをいう。The battery outer can is a bottomed one having an opening at one end, and the outer can itself serves as a terminal for taking out current from the battery to the outside. For closing the opening of the battery outer can,
The sealing lid itself serves as a terminal for extracting current from the battery to the outside.
【００１３】請求項２に記載の発明は、請求項１に記載
の発明において、前記正極集電体は、集電網であり、か
つ、その集電網と前記電池外装缶または封口蓋の内面と
は、集電網の網目内に導電性接着材が入り込んだ状態で
接合されていることを特徴とする。According to a second aspect of the present invention, in the first aspect of the present invention, the positive electrode current collector is a current collector network, and the current collector network and the inner surface of the battery outer can or the sealing lid are not connected. The current collector network is joined in a state where the conductive adhesive enters the mesh.
【００１４】上記の構成であれば、集電網と導電性接着
材との接触面積が大きくなるので、電池外装缶または封
口蓋の内面と集電網とが特に強固に接合した電池とな
る。According to the above configuration, the contact area between the current collecting network and the conductive adhesive is increased, so that a battery in which the inner surface of the battery outer can or the sealing lid and the current collecting network are particularly strongly bonded is obtained.
【００１５】請求項３に記載の発明は、請求項１または
２に記載の発明において、前記導電性接着材は、導電性
塗料の乾燥被膜であることを特徴とする。According to a third aspect of the present invention, in the first or second aspect, the conductive adhesive is a dry film of a conductive paint.
【００１６】導電性塗料の乾燥被膜は、例えば、電池外
装缶または封口蓋の内面に導電性塗料を塗布して液膜を
形成し、その液膜形成部分に集電体を載置した後、乾燥
固化させれば形成することができる。よって、電池外装
缶または封口蓋と集電体とを簡便に接合させることがで
き、生産性や低コスト性の観点から有利である。The dried film of the conductive paint is formed by, for example, applying a conductive paint to the inner surface of a battery outer can or a sealing lid to form a liquid film, and placing a current collector on the liquid film forming portion. It can be formed by drying and solidifying. Accordingly, the battery outer can or the sealing lid can be easily joined to the current collector, which is advantageous from the viewpoint of productivity and low cost.
【００１７】請求項４に記載の発明は、請求項１〜３の
いずれか一項に記載の発明において、前記電池外装缶ま
たは封口蓋は、アルミニウム板とステンレス板とを貼り
合わせてなるクラッド材から構成され、かつ、電池外装
缶または封口蓋の内面がアルミニウム板であることを特
徴とする。According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the battery outer can or the sealing lid is a clad material formed by bonding an aluminum plate and a stainless steel plate. And the inner surface of the battery outer can or the sealing lid is an aluminum plate.
【００１８】アルミニウムは、高電圧であっても腐食を
生じないものであるが、柔らかい金属であるため、強度
面でやや劣る。一方、ステンレスは、上述したように、
４Ｖ以上の高電圧で腐食の懸念があるが、アルミニウム
に比べ、強度面に優れる。よって、アルミニウム板とス
テンレス板とを貼り合わせてなるクラッド材を電池外装
缶または封口蓋に用いれば、腐食のおそれがなく、しか
も強度面で支障がないため、その結果として、優れた電
池となる。Aluminum does not corrode even at a high voltage. However, since it is a soft metal, its strength is somewhat inferior. On the other hand, stainless steel, as described above,
There is a concern about corrosion at a high voltage of 4 V or more, but it is superior in strength in comparison with aluminum. Therefore, if a cladding material obtained by bonding an aluminum plate and a stainless steel plate is used for a battery outer can or a sealing lid, there is no risk of corrosion, and there is no problem in strength, and as a result, an excellent battery is obtained. .
【００１９】請求項５に記載の発明は、請求項１〜４に
記載の発明において、前記正極は、リチウムを含有する
複合酸化物を活物質とし、かつ、前記負極は、リチウム
イオンを吸蔵放出できる炭素材料を活物質とすることを
特徴とする。According to a fifth aspect of the present invention, in the first aspect, the positive electrode is made of a composite oxide containing lithium as an active material, and the negative electrode stores and releases lithium ions. It is characterized by using a carbon material that can be used as an active material.
【００２０】上記の構成によれば、電池外装缶または封
口蓋と集電体とが充分な接合強度で接合したリチウムイ
オン電池を提供できる。According to the above configuration, it is possible to provide a lithium ion battery in which the battery outer can or sealing lid and the current collector are joined with sufficient joining strength.
【００２１】[0021]
【発明の実施の形態】本発明の実施の形態を、コイン形
のリチウムイオン電池を例として、図面を用いて説明す
る。図１は、この電池の構成を示す模式的な断面図であ
る。図２は、正極缶と正極集電体との接合部分を示す模
式的な拡大断面図である。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings, taking a coin-shaped lithium ion battery as an example. FIG. 1 is a schematic sectional view showing the configuration of this battery. FIG. 2 is a schematic enlarged cross-sectional view showing a joint portion between the positive electrode can and the positive electrode current collector.
【００２２】図１に示すように、この電池は、外観がコ
イン形状であって、金属アルミニウム板とステンレス板
とを貼り合わせ、内面が金属アルミニウム板になるよう
にしたクラッド材製の正極缶（電池外装缶）１を有して
おり、この正極缶１内には、ＬｉＣｏＯ2 を活物質とす
る正極２と、天然黒鉛を活物質とする負極３と、両極を
離間するポリプロピレン不織布からなるセパレータ４と
から構成される電極体５が収容されている。なお、セパ
レータ４には、エチレンカーボネート（ＥＣ）とジメチ
ルカーボネート（ＤＭＣ）の等量混合溶媒にヘキサフル
オロリン酸リチウム（ＬｉＰＦ6 ）を１Ｍ（モル／リッ
トル）の割合で溶かしてなる電解液が含浸されている。
そして、正極缶１の開口部は、絶縁ガスケット６を介し
て、周縁部が折り曲がっているステンレス製の負極キャ
ップ（封口蓋）７がかしめ固定され、封口されている。
なお、図中の８は、ステンレス製の負極集電網であり、
負極キャップ７にスポット溶接で接合されている。As shown in FIG. 1, this battery has a coin-shaped appearance, a metal aluminum plate and a stainless steel plate are attached to each other, and a cathode can (made of a clad material) having an inner surface formed of a metal aluminum plate. A battery can 1 has a positive electrode can 1 containing LiCoO 2 as an active material, a negative electrode 3 using natural graphite as an active material, and a separator made of a nonwoven polypropylene fabric separating both electrodes. 4 is accommodated. The separator 4 is impregnated with an electrolytic solution obtained by dissolving lithium hexafluorophosphate (LiPF 6 ) in a mixed solvent of equal amounts of ethylene carbonate (EC) and dimethyl carbonate (DMC) at a ratio of 1 M (mol / liter). Have been.
A stainless steel negative electrode cap (sealing lid) 7 whose peripheral edge is bent is fixed by caulking and sealing the opening of the positive electrode can 1 via an insulating gasket 6.
Reference numeral 8 in the drawing denotes a stainless steel negative electrode current collector network,
It is joined to the negative electrode cap 7 by spot welding.
【００２３】上記正極缶１の内底部には、図２に示すよ
うに、金属アルミニウム製の正極集電網９が、その集電
網９の網目内に導電性塗料の乾燥被膜１０が入り込んだ
状態で接合されている。なお、図示のように、集電網９
の一部が露出した状態になっておれば、正極２と集電網
９とが点接触になるため、電気的接続の確実性の点で好
適である。As shown in FIG. 2, a positive electrode current collecting network 9 made of metallic aluminum is provided on the inner bottom of the positive electrode can 1 in a state where a dry coating 10 of a conductive paint has entered the mesh of the current collecting network 9. Are joined. In addition, as shown in the figure, the power collection network 9
Is partially exposed, the positive electrode 2 and the current collecting network 9 are in point contact, which is preferable in terms of the reliability of electrical connection.
【００２４】なお、電池の寸法は、直径２４．５ｍｍ、
高さ約３ｍｍである。The dimensions of the battery were 24.5 mm in diameter,
The height is about 3 mm.
【００２５】上記構造のリチウムイオン電池を、以下の
ようにして作製した。A lithium ion battery having the above structure was manufactured as follows.
【００２６】まず、正極活物質としてのＬｉＣｏＯ
2 と、導電剤としてのアセチレンブラックと、結着剤と
してのポリテトラフルオロエチレン樹脂とを、９０：
５：５の質量比で混合したものを円板状に加圧成形する
ことにより、正極を作製した。First, LiCoO as a positive electrode active material
2 , acetylene black as a conductive agent, and polytetrafluoroethylene resin as a binder,
A mixture obtained by mixing at a mass ratio of 5: 5 was press-formed into a disk shape to prepare a positive electrode.
【００２７】また、負極活物質としての天然黒鉛と、導
電剤としてのアセチレンブラックと、結着剤としてのポ
リテトラフルオロエチレン樹脂とを、９０：５：５の質
量比で混合したものを円板状に加圧成形することによ
り、負極を作製した。A disc prepared by mixing natural graphite as an anode active material, acetylene black as a conductive agent, and polytetrafluoroethylene resin as a binder at a mass ratio of 90: 5: 5. The negative electrode was produced by press-molding in a shape.
【００２８】つぎに、正極缶の内底部に、水ガラス（ケ
イ酸カリウムの水溶液）に炭素粉末を２０質量％（塗料
全体中に占める割合）分散させてなる導電性塗料を塗布
して、厚み１５０μｍの液膜を形成した後、その液膜形
成部分に正極集電網（厚み３００μｍ）を載置し、その
状態のまま１５０℃の温度で乾燥固化することにより、
正極缶と正極集電網の接合を行った。一方、ステンレス
製の負極キャップの内壁面にステンレス製の負極集電網
をスポット溶接で接合した。Next, a conductive paint obtained by dispersing carbon powder in water glass (aqueous solution of potassium silicate) in an amount of 20% by mass (percentage in the whole paint) is applied to the inner bottom of the positive electrode can. After forming a liquid film of 150 μm, a positive electrode current collector network (thickness of 300 μm) is placed on the liquid film forming portion, and dried and solidified at a temperature of 150 ° C. in that state,
The positive electrode can was joined to the positive electrode current collector network. On the other hand, a stainless steel negative electrode current collector was joined to the inner wall surface of the stainless steel negative electrode cap by spot welding.
【００２９】つづいて、上記正極缶内の正極集電網の上
に、前記正極とポリプロピレン不織布からなるセパレー
タとをこの順で載置し、そのセパレータに対し電解液を
注液した後、さらに前記負極を載置した。そして、上記
電池外装缶の開口部に、ポリプロピレン製の絶縁ガスケ
ットを介して、前記集電網付き負極キャップを圧入しか
しめ固定することにより、リチウムイオン電池を製造し
た。Subsequently, the positive electrode and a separator made of a polypropylene non-woven fabric are placed in this order on the positive electrode current collecting network in the positive electrode can, and an electrolyte is injected into the separator. Was placed. Then, the negative electrode cap with the current collecting network was press-fitted and fixed to the opening of the battery outer can via an insulating gasket made of polypropylene, whereby a lithium ion battery was manufactured.
【００３０】なお、上記実施の形態においては、導電性
塗料として、水ガラスに炭素粉末を分散させてなる塗料
を用いたが、これに限定するものではない。本発明にお
いて、導電性塗料とは、導電性粒子を粘結剤（合成樹
脂、低融点ガラス等）および溶剤に分散させた液状物で
あって、これを塗布し乾燥固化してなる乾燥被膜中で導
電性粒子同士が接触し、被膜自体が導電性を示すものを
いう。導電性粒子としては、上記炭素粉末の他、例え
ば、銀粉、銅粉等の金属粉末が好適に用いられ、また、
粘結剤としては、上記水ガラスの他、例えば、エチルセ
ルロース、フェノール樹脂、硼酸塩等が好適に用いられ
る。また、導電性塗料の他、合成樹脂（粉体）中に導電
性粒子が分散されてなる導電性樹脂を用いることも可能
である。この場合、正極缶と正極集電体の接合は、導電
性樹脂の熱溶着を利用する。In the above-described embodiment, a paint made by dispersing carbon powder in water glass is used as the conductive paint. However, the present invention is not limited to this. In the present invention, the conductive paint is a liquid material in which conductive particles are dispersed in a binder (synthetic resin, low-melting glass, etc.) and a solvent. Means that the conductive particles come into contact with each other and the coating itself shows conductivity. As the conductive particles, other than the carbon powder, for example, silver powder, metal powder such as copper powder is preferably used,
As the binder, in addition to the above-mentioned water glass, for example, ethyl cellulose, phenol resin, borate and the like are suitably used. In addition to the conductive paint, it is also possible to use a conductive resin in which conductive particles are dispersed in a synthetic resin (powder). In this case, the joining between the positive electrode can and the positive electrode current collector utilizes thermal welding of a conductive resin.
【００３１】また、上記正極缶と正極集電網の接合は、
図２に示すような接合に限定するものではなく、例え
ば、導電性塗料の乾燥被膜１０が正極２に接触するよう
な接合であってもよい。The connection between the positive electrode can and the positive electrode current collector network is as follows:
The joining is not limited to the joining as shown in FIG. 2, and may be, for example, a joining in which the dry film 10 of the conductive paint contacts the positive electrode 2.
【００３２】さらに、前記正極缶としては、アルミニウ
ム板とステンレス板とを貼り合わせてなるクラッド材を
用いたが、これに限定するものではない。上記ステンレ
ス板の他に、例えば、銅、鉄、ニッケル等のアルミニウ
ム以外の金属材料等からなる板を用いることができる。
また、アルミニウム板からなるものや、缶内部側がアル
ミニウム板である３層以上の多層構造のものも用いるこ
とができる。Further, as the positive electrode can, a clad material obtained by bonding an aluminum plate and a stainless steel plate was used, but the present invention is not limited to this. In addition to the stainless steel plate, for example, a plate made of a metal material other than aluminum such as copper, iron, and nickel can be used.
Further, an aluminum plate or a multilayer structure having three or more layers in which the inner side of the can is an aluminum plate can be used.
【００３３】なお、上記実施の形態においては、負極キ
ャップと負極集電体にステンレスを用いたが、これに限
定するものではない。例えば、ニッケル、銅等のステン
レス以外の金属材料を用いることができる。なお、銅を
用いた場合、スポット溶接での接合は接合強度が不充分
となりやすいため、前記導電性接着材で接合するのが好
ましい。In the above embodiment, stainless steel is used for the negative electrode cap and the negative electrode current collector, but the present invention is not limited to this. For example, metal materials other than stainless steel, such as nickel and copper, can be used. When copper is used, the joining strength by spot welding is likely to be insufficient, so it is preferable to join with the conductive adhesive.
【００３４】本発明は、上記コイン形のリチウムイオン
電池に限定するものではなく、その他の電池にも適用す
ることができる。The present invention is not limited to the coin type lithium ion battery, but can be applied to other batteries.
【００３５】但し、本発明を上記リチウムイオン電池に
適用する場合には、正極活物質としては上記ＬｉＣｏＯ
2の他、例えば、ＬｉＮｉＯ2 、ＬｉＦｅＯ2 、ＬｉＭ
ｎ2Ｏ4 等のリチウム含有複合酸化物が好適に用いら
れ、また、負極活物質としては、上記天然黒鉛の他、人
造黒鉛や、部分的に黒鉛構造を持つ炭素質材料等のリチ
ウムイオンを吸蔵放出できる炭素材料等が好適に用いら
れる。さらに、電解液の溶媒としては上記のＥＣとＤＭ
Ｃの他、例えば、プロピレンカーボネート、ビニレンカ
ーボネート、γ−ブチロラクトン等の有機溶媒や、これ
らとジエチルカーボネート、エチルメチルカーボネー
ト、１，２−ジメトキシエタン、１，２−ジエトキシエ
タン、エトキシメトキシエタン等の低沸点溶媒との混合
溶媒を用いることができる。また、電解液の溶質として
は、上記ＬｉＰＦ6 の他、ＬｉＢＦ4、ＬｉＣｌＯ4 、
ＬｉＣＦ3 ＳＯ3 、ＬｉＮ（ＣＦ3 ＳＯ2 ）2 、ＬｉＮ
（Ｃ2Ｆ5 ＳＯ2 ）2 等を用いることができる。However, when the present invention is applied to the above-mentioned lithium ion battery, the above-mentioned LiCoO 2 is used as the positive electrode active material.
2 other, for example, LiNiO 2, LiFeO 2, LiM
A lithium-containing composite oxide such as n 2 O 4 is preferably used. As the negative electrode active material, other than the above-described natural graphite, artificial graphite and lithium ions such as a carbonaceous material partially having a graphite structure may be used. A carbon material capable of inserting and extracting is preferably used. Further, as the solvent of the electrolytic solution, the above EC and DM
In addition to C, for example, organic solvents such as propylene carbonate, vinylene carbonate and γ-butyrolactone, and organic solvents such as diethyl carbonate, ethyl methyl carbonate, 1,2-dimethoxyethane, 1,2-diethoxyethane, ethoxymethoxyethane, etc. A mixed solvent with a low boiling point solvent can be used. As the solute of the electrolyte solution, addition of the LiPF 6, LiBF 4, LiClO 4 ,
LiCF 3 SO 3 , LiN (CF 3 SO 2 ) 2 , LiN
(C 2 F 5 SO 2 ) 2 or the like can be used.
【００３６】[0036]
【実施例】つぎに、本発明について、実施例および比較
例に基づいてさらに詳細に説明するが、本発明は下記の
実施例に限定されるものではない。Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.
【００３７】（実施例１）実施例１としては、上記発明
の実施の形態に示す方法と同様の方法にて作製した電池
を用いた。この電池を本発明電池とした。Example 1 In Example 1, a battery manufactured by the same method as that described in the embodiment of the present invention was used. This battery was designated as the battery of the present invention.
【００３８】（比較例１）正極缶と正極集電網の接合方
法をスポット溶接に代えた以外は、実施例１と同様にし
て、リチウムイオン電池を製造した。なお、この電池を
比較電池とした。Comparative Example 1 A lithium ion battery was manufactured in the same manner as in Example 1 except that the method of joining the positive electrode can and the positive electrode current collector network was changed to spot welding. This battery was used as a comparative battery.
【００３９】上記で作製した本発明電池および比較電池
について、下記に示す方法で、充放電サイクル特性を評
価した。The charge / discharge cycle characteristics of the battery of the present invention and the comparative battery produced as described above were evaluated by the following method.
【００４０】（充放電サイクル特性）充電は、定電流３
ｍＡで電池電圧４．２Ｖを充電終止電圧とし、放電は、
定電流３ｍＡで電池電圧３．０Ｖを放電終止電圧とし
た。また、電池の放電容量が１サイクル目の放電容量の
半分以下になったときをサイクル寿命の終了とした。な
お、試験数はそれぞれ１０個とした。(Charge / Discharge Cycle Characteristics)
A battery voltage of 4.2 V at mA was taken as a charge end voltage, and discharge was
At a constant current of 3 mA, a battery voltage of 3.0 V was taken as a discharge end voltage. When the discharge capacity of the battery became half or less of the discharge capacity in the first cycle, the cycle life was terminated. The number of tests was 10 each.
【００４１】（結果）本発明電池（導電性接着材による
接合）は、１サイクル目における放電容量が平均８０ｍ
Ａｈであったのに対し、比較電池（スポット溶接による
接合）は、１サイクル目における放電容量が平均７９ｍ
Ａｈであった。この結果より、導電性接着材による接合
であっても、スポット溶接で接合した場合と同程度の初
期放電容量を確保できることがわかった。(Result) The battery of the present invention (joined with a conductive adhesive) had an average discharge capacity of 80 m in the first cycle.
Ah, whereas the comparative battery (joined by spot welding) had an average discharge capacity of 79 m in the first cycle.
Ah. From this result, it was found that the same initial discharge capacity as that of the case of joining by spot welding can be secured even in the case of joining with the conductive adhesive.
【００４２】また、本発明電池は、サイクル寿命が２８
０〜３１０回であったのに対し、比較電池は、７〜１６
０回と少なく、またサイクル回数のバラツキも大きかっ
た。この結果より、スポット溶接で接合された電池は、
導電性接着材で接合された電池に比べ、充放電サイクル
特性に劣ることがわかった。The battery of the present invention has a cycle life of 28.
0 to 310 times, whereas the comparative battery was 7 to 16 times.
It was as small as 0 times, and the variation in the number of cycles was large. From this result, the batteries joined by spot welding
It was found that the charge / discharge cycle characteristics were inferior to those of the battery joined with the conductive adhesive.
【００４３】上記の結果を踏まえ、上記サイクル試験後
の比較電池を分解してみたところ、１０個の電池全てに
おいて、正極缶と正極集電体の接合が外れていた。一
方、上記サイクル試験後の本発明電池を分解してみたと
ころ、接合が外れているものはなかった。これらのこと
から、比較電池が充放電サイクル特性に劣るのは、正極
缶と正極集電体の接合が外れたことによることがわかっ
た。Based on the above results, when the comparative battery after the above cycle test was disassembled, the connection between the positive electrode can and the positive electrode current collector was released in all 10 batteries. On the other hand, when the battery of the present invention after the above-mentioned cycle test was disassembled, no battery was disconnected. From these facts, it was found that the inferior charge-discharge cycle characteristics of the comparative battery were due to the disconnection between the positive electrode can and the positive electrode current collector.
【００４４】[0044]
【発明の効果】本発明は、電池外装缶または封口蓋と集
電体とを導電性接着材で接合した点に特徴を有するが、
このような本発明によると、アルミニウム同士であって
も接合強度が充分な電池を簡便に提供できる。The present invention is characterized in that the battery outer can or sealing lid and the current collector are joined by a conductive adhesive.
According to the present invention, it is possible to easily provide a battery having sufficient bonding strength even with aluminum.
【図１】本発明の一例であるコイン形のリチウムイオン
電池の構成を示す模式的な断面図である。FIG. 1 is a schematic cross-sectional view showing a configuration of a coin-shaped lithium ion battery as an example of the present invention.
【図２】正極缶と正極集電体との接合部分を示す模式的
な拡大断面図である。FIG. 2 is a schematic enlarged cross-sectional view showing a joint portion between a positive electrode can and a positive electrode current collector.
１ 正極缶 ２ 正極 ３ 負極 ４ セパレータ ５ 電極体 ６ 絶縁ガスケット ７ 負極キャップ ８ 負極集電網 ９ 正極集電網 １０ 導電性接着材 DESCRIPTION OF SYMBOLS 1 Positive electrode can 2 Positive electrode 3 Negative electrode 4 Separator 5 Electrode body 6 Insulating gasket 7 Negative cap 8 Negative current collecting network 9 Positive current collecting network 10 Conductive adhesive
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山本 祐司 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 (72)発明者 山下 哲哉 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 Ｆターム(参考） 5H011 AA09 CC10 5H017 AA03 AS02 BB11 CC05 EE05 5H029 AJ14 AK03 AL07 AM03 AM04 AM05 AM07 BJ03 BJ12 CJ02 CJ05 CJ22 DJ02 DJ04 DJ07 EJ01 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yuji Yamamoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Tetsuya Yamashita 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 F-term in Sanyo Electric Co., Ltd. (reference) 5H011 AA09 CC10 5H017 AA03 AS02 BB11 CC05 EE05 5H029 AJ14 AK03 AL07 AM03 AM04 AM05 AM07 BJ03 BJ12 CJ02 CJ05 CJ22 DJ02 DJ04 DJ07 EJ01
Claims (5)
向させてなる電極体と、前記電極体を収容する電池外装
缶と、前記電池外装缶の開口部を封口する封口蓋と、前
記正極と電気的に接続した正極集電体とを有し、かつ、 前記正極集電体と、前記正極集電体と電気的に接続され
る電池外装缶または封口蓋の内面とが、アルミニウムで
構成された電池において、 前記電池外装缶または封口蓋の内面と正極集電体とは、
導電性接着材により接合されている、ことを特徴とする
電池。1. An electrode body comprising a positive electrode and a negative electrode opposed to each other with a separator interposed therebetween, a battery outer can housing the electrode body, a sealing lid for closing an opening of the battery outer can, and the positive electrode; An electrically connected positive electrode current collector, and the positive electrode current collector and an inner surface of a battery outer can or a sealing lid electrically connected to the positive electrode current collector are made of aluminum. In the battery, the inner surface of the battery outer can or sealing lid and the positive electrode current collector,
A battery, which is joined by a conductive adhesive.
つ、その集電網と前記電池外装缶または封口蓋の内面と
は、集電網の網目内に導電性接着材が入り込んだ状態で
接合されている、請求項１記載の電池。2. The positive electrode current collector is a current collecting network, and the current collecting network and the inner surface of the battery outer can or the sealing lid are in a state in which a conductive adhesive has entered the mesh of the current collecting network. The battery of claim 1, wherein the batteries are joined.
燥被膜である、請求項１または２記載の電池。3. The battery according to claim 1, wherein the conductive adhesive is a dry film of a conductive paint.
ミニウム板とステンレス板とを貼り合わせてなるクラッ
ド材から構成され、かつ、電池外装缶または封口蓋の内
面がアルミニウム板である、請求項１〜３のいずれか一
項に記載の電池。4. The battery outer can or the sealing lid is made of a clad material formed by laminating an aluminum plate and a stainless steel plate, and the inner surface of the battery outer can or the sealing lid is an aluminum plate. The battery according to any one of claims 1 to 3.
酸化物を活物質とし、かつ、前記負極は、リチウムイオ
ンを吸蔵放出できる炭素材料を活物質とする、請求項１
〜４のいずれか一項に記載の電池。5. The positive electrode has a composite oxide containing lithium as an active material, and the negative electrode has a carbon material capable of inserting and extracting lithium ions as an active material.
The battery according to any one of claims 4 to 4.
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|---|---|---|---|
| JP2000263521A JP4190139B2 (en) | 2000-08-31 | 2000-08-31 | battery |
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|---|---|---|---|
| JP2000263521A JP4190139B2 (en) | 2000-08-31 | 2000-08-31 | battery |
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| Publication Number | Publication Date |
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| JP4190139B2 JP4190139B2 (en) | 2008-12-03 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100495567B1 (en) * | 2002-08-14 | 2005-06-16 | 한국과학기술원 | Lithium/Sulfur Rechargeable Battery Comprising Electrode Composition Based on Vinylidene Fluoride Polymer as A Binder, and Preparation Method thereof |
| JP2008071612A (en) * | 2006-09-14 | 2008-03-27 | Hitachi Maxell Ltd | Flat nonaqueous electrolyte secondary battery |
| JP2008251381A (en) * | 2007-03-30 | 2008-10-16 | Kri Inc | Nonaqueous secondary battery |
| JP2017117617A (en) * | 2015-12-24 | 2017-06-29 | セイコーインスツル株式会社 | Nonaqueous electrolyte secondary battery |
| JP2018067508A (en) * | 2016-10-21 | 2018-04-26 | 三洋化成工業株式会社 | Method for manufacturing lithium ion battery |
-
2000
- 2000-08-31 JP JP2000263521A patent/JP4190139B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100495567B1 (en) * | 2002-08-14 | 2005-06-16 | 한국과학기술원 | Lithium/Sulfur Rechargeable Battery Comprising Electrode Composition Based on Vinylidene Fluoride Polymer as A Binder, and Preparation Method thereof |
| JP2008071612A (en) * | 2006-09-14 | 2008-03-27 | Hitachi Maxell Ltd | Flat nonaqueous electrolyte secondary battery |
| JP2008251381A (en) * | 2007-03-30 | 2008-10-16 | Kri Inc | Nonaqueous secondary battery |
| JP2017117617A (en) * | 2015-12-24 | 2017-06-29 | セイコーインスツル株式会社 | Nonaqueous electrolyte secondary battery |
| JP2018067508A (en) * | 2016-10-21 | 2018-04-26 | 三洋化成工業株式会社 | Method for manufacturing lithium ion battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4190139B2 (en) | 2008-12-03 |
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