JPH08138680A - Electrode base plate for battery and manufacture thereof - Google Patents
Electrode base plate for battery and manufacture thereofInfo
- Publication number
- JPH08138680A JPH08138680A JP6272290A JP27229094A JPH08138680A JP H08138680 A JPH08138680 A JP H08138680A JP 6272290 A JP6272290 A JP 6272290A JP 27229094 A JP27229094 A JP 27229094A JP H08138680 A JPH08138680 A JP H08138680A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- metal
- low porosity
- electrode substrate
- porosity
- 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
Landscapes
- Cell Electrode Carriers And Collectors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ニッケル−カドミウム
電池、ニッケル−亜鉛電池、ニッケル−水素電池などの
アルカリ蓄電池やその他Ｌｉ２次電池などに用いる電極
基板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrode substrate used for an alkaline storage battery such as a nickel-cadmium battery, a nickel-zinc battery, a nickel-hydrogen battery and other Li secondary batteries.
【０００２】[0002]
【従来の技術】各種の電源として使われる蓄電池として
鉛蓄電池とアルカリ蓄電池がある。このうちアルカリ蓄
電池は高信頼性が期待でき、小型軽量化も可能などの理
由で小型電池は各種ポータブル機器用に、大型は産業用
として広く使われてきた。このアルカリ蓄電池におい
て、負極としてはカドミウムの他に亜鉛、鉄、水素など
が対象となっている。しかし正極としては一部空気極や
酸化銀極なども取り上げられているが、ほとんどの場合
ニッケル極である。ポケット式から焼結式に代わって特
性が向上し、さらに密閉化が可能になるとともに用途も
広がった。2. Description of the Related Art Lead-acid batteries and alkaline batteries are used as storage batteries used as various power sources. Among them, the alkaline storage battery can be expected to have high reliability and can be made compact and lightweight. For this reason, the small battery has been widely used for various portable devices and the large battery for industrial use. In this alkaline storage battery, zinc, iron, hydrogen, etc. are targeted as the negative electrode in addition to cadmium. However, as the positive electrode, an air electrode and a silver oxide electrode are also taken up, but in most cases, it is a nickel electrode. The characteristics have been improved from the pocket type to the sintering type, and the sealing has been made possible and the use has expanded.
【０００３】しかし通常の粉末焼結式では基板気孔率を
８５％以上にすると強度が大幅に低下するので活物質の
充填に限界があり、したがって電池としての高容量化に
限界がある。そこで９０％以上のような一層高気孔率の
基板として焼結基板に代えて発泡状基板や繊維状基板が
取り上げられ、一部実用化されている。しかし発泡状樹
脂に金属ペーストを塗着し、これを焼結することで高気
孔率の焼結体を得ることが古くから提案されている。た
とえば特公昭３８−１７５５４では、金属粉末を泥状に
してウレタンフォームに含浸して水素中で樹脂を炭化し
たのち金属を半融状態にして金属多孔体をつくる方法が
開示されている。However, in the usual powder sintering method, when the porosity of the substrate is 85% or more, the strength is significantly lowered, so that there is a limit to the filling of the active material, and therefore, there is a limit to increase the capacity of the battery. Therefore, as a substrate having a higher porosity of 90% or more, a foamed substrate or a fibrous substrate has been taken up in place of the sintered substrate, and is partially put into practical use. However, it has long been proposed to obtain a high porosity sintered body by applying a metal paste to a foamed resin and sintering this. For example, Japanese Examined Patent Publication No. 38-17554 discloses a method in which a metal powder is made into a muddy state and impregnated in urethane foam to carbonize the resin in hydrogen, and then the metal is semi-molten to form a metal porous body.
【０００４】[0004]
【発明が解決しようとする課題】例えば金属粉末として
ニッケル粉末をペースト状にして発泡状樹脂に含浸して
水素中で焼結することで９０％以上の高気孔率を持つ金
属多孔体をつくることができ、電池用基体として高容量
の電極の製造が可能になる。しかし、高気孔率であるこ
とと通常の粉末焼結体に用いるパンチングメタルのよう
な多孔性の芯材を用いていないことから、引張り強度の
ような機械的強度は小さい。[Problems to be Solved by the Invention] For example, a metal porous body having a high porosity of 90% or more is produced by forming a paste of nickel powder as a metal powder into a foamed resin and sintering it in hydrogen. This makes it possible to manufacture a high-capacity electrode as a battery substrate. However, since it has a high porosity and does not use a porous core material such as punching metal used for a normal powder sintered body, mechanical strength such as tensile strength is small.
【０００５】したがって、たとえばフープ状で活物質を
充填する場合には、搬送時に加わる荷重により変形や破
損の恐れがある。さらに基体の電気抵抗が若干増すの
で、特に高放電の場合での電圧低下が大きい。Therefore, when the active material is filled in a hoop shape, for example, the load applied during transportation may cause deformation or damage. Furthermore, since the electric resistance of the substrate is slightly increased, the voltage drop is large especially in the case of high discharge.
【０００６】また、通常電極には端子板をスポット溶接
で取りつけるが、気孔率が大きいことと芯材を持ってい
ないことからスポット部が破損する確率が高くなる。ま
た、円筒構造で電極上部に円形の端子を用い、これと電
極上部とを溶接する、いわゆるタブレス方式の場合には
電極上部の強度が低いので、この構成も採用しがたい。Further, although a terminal plate is usually attached to the electrode by spot welding, the probability of damage to the spot portion is high because of the large porosity and the absence of a core material. Further, in the case of a so-called tabless method in which a circular terminal is used in the upper part of the electrode having a cylindrical structure and the upper part of the electrode is welded, the strength of the upper part of the electrode is low, and therefore this structure is also difficult to employ.
【０００７】本発明は、こうした実情の下に前記欠点を
解消すべく、強度を確保するとともに電池特性を向上さ
せた電池用電極基板を提供することを目的とするもので
ある。Under these circumstances, the present invention has as its object the provision of an electrode substrate for a battery, in which the strength is secured and the battery characteristics are improved in order to solve the above-mentioned drawbacks.
【０００８】[0008]
【課題を解決するための手段】本発明者は、鋭意検討し
た結果、電池用の電極基板として、選択的に低気孔率部
分が配置された金属多孔体を用いることが有効であるこ
とを知見し、本発明に至った。Means for Solving the Problems As a result of intensive studies, the present inventor has found that it is effective to use a metal porous body having a low porosity portion selectively arranged as an electrode substrate for a battery. Then, the present invention was achieved.
【０００９】すなわち、本発明は、(1) 電池用集電体に
用いる活物質を保持する電極基板であって、選択的に低
気孔率部分が配置された金属多孔体から構成することを
特徴とする電池用電極基板、(2) 多孔性の樹脂芯体の骨
格に、金属、合金もしくは金属化合物粉末と結着剤とを
主成分としたペーストを含浸塗着した後、凹部を設けた
ロール間を通すことで選択的に低気孔率部を形成せし
め、ついで金属が焼結する温度以上で加熱してシート状
の三次元網目状金属多孔体とすることを特徴とする電池
用電極基板の製造方法、に関するものである。That is, the present invention is: (1) An electrode substrate for holding an active material used for a current collector for a battery, which is composed of a metal porous body in which a low porosity portion is selectively arranged. (2) A roll having a concave portion formed by impregnating and coating a skeleton of a porous resin core body with a paste containing a metal, an alloy or a metal compound powder and a binder as main components. A low porosity portion is selectively formed by passing through a space, and then heated at a temperature equal to or higher than the temperature at which the metal is sintered to form a sheet-like three-dimensional mesh metal porous body of a battery electrode substrate. The present invention relates to a manufacturing method.
【００１０】本発明は、上記のように基板中に選択的に
低気孔率部分を配置することが重要である。基板中の特
に強度が要求される部位を低気孔率とするのが好まし
い。In the present invention, it is important to selectively dispose the low porosity portion in the substrate as described above. It is preferable that the portion of the substrate that requires particularly high strength has a low porosity.
【００１１】例えば、電極基板として端子を溶接する部
分に当たる部分を低気孔率とし、その他の活物質材を充
填保持する部分は高気孔率とすることで電池としての高
容量化を実現し、かつ機械的な強度を確保する。ここで
電極基板の（低気孔率部以外の）気孔率は高容量を可能
にするために９０〜９７％とし、低気孔率部は強度や電
気電導度を改良するためであるから、基板本体より小さ
ければよいが、製法上や特性を勘案すると、その気孔率
は５０〜８０％とするのが好ましい。また、端子の溶接
を容易とするため低気孔率部をあらかじめ加圧すること
が好ましい。また、基板中の低気孔率部の割合は、面積
比で３０％以下とするのが好ましい。For example, a portion corresponding to a portion where an electrode substrate is welded has a low porosity, and a portion for filling and holding other active material has a high porosity to realize a high capacity as a battery, and Ensure mechanical strength. Here, the porosity (other than the low porosity part) of the electrode substrate is set to 90 to 97% in order to enable high capacity, and the low porosity part is for improving the strength and the electric conductivity. The smaller the porosity, the more the porosity is preferably 50 to 80% in consideration of the production method and the characteristics. Further, in order to facilitate the welding of the terminal, it is preferable to pressurize the low porosity portion in advance. The ratio of the low porosity portion in the substrate is preferably 30% or less in terms of area ratio.
【００１２】また、これら電極基板は、多孔性の樹脂芯
材の骨格に、金属もしくは合金粉末と結着剤とを主成分
としたペーストを含浸塗着した後、凹部を設けたロール
間を通すことで低気孔率部を形成せしめ、ついで金属が
焼結する温度以上で加熱してシート状の三次元網目状金
属多孔体を得た後、成形することにより作成することが
できる。ここでロールとしては溝状凹部もしくはスポッ
ト状の凹部を有するものを用いる。Further, these electrode substrates are formed by impregnating a skeleton of a porous resin core material with a paste containing a metal or alloy powder as a main component and a binder, and then passing it between rolls having concave portions. This can be formed by forming a low porosity portion, then heating at a temperature at which the metal is sintered or higher to obtain a sheet-shaped three-dimensional mesh metal porous body, and then molding. Here, as the roll, one having a groove-shaped recess or a spot-shaped recess is used.
【００１３】前記多孔性の樹脂芯体としては、特に制限
はなく、多孔性の樹脂であれば使用することができる
が、特にポリウレタンフォーム、ポリオレフィンの発泡
体などが好ましい。又、多孔性樹脂芯体を含浸するペー
ストは、金属、合金もしくは金属化合物粉末と結着剤を
主成分とするものである。前記金属成分粉末としては、
以後の工程で焼結され、集電体としての電極基板用多孔
体を構成し得るものであればよいが、好ましくはニッケ
ル、Ａｌ、Ｃｕ、Ｔｉなどである。結着剤としては、ア
クリル樹脂、フェノール樹脂などが好ましい。その他ペ
ーストにはカルボキシセルロースなどの添加剤、希釈剤
などが使用される。The porous resin core is not particularly limited, and any porous resin can be used, but polyurethane foam, polyolefin foam and the like are particularly preferable. The paste impregnating the porous resin core body contains metal, alloy or metal compound powder and a binder as main components. As the metal component powder,
Any material may be used as long as it can be sintered in the subsequent steps to form a porous body for an electrode substrate as a current collector, but nickel, Al, Cu, Ti and the like are preferable. As the binder, acrylic resin, phenol resin and the like are preferable. Other additives such as carboxycellulose and diluents are used in the paste.
【００１４】前記のように、本願発明の電池用電極基板
は、多孔性の樹脂芯体の骨格を、金属粉末と結着剤とを
主成分としたペースト中に浸漬し、塗着したスラリー液
の余剰分を絞りロールにより除去しその後加熱処理して
得られる。As described above, in the battery electrode substrate of the present invention, the skeleton of the porous resin core is dipped in the paste containing the metal powder and the binder as the main components, and the slurry liquid is applied. Is removed by a squeezing roll and then heat-treated.
【００１５】絞りロールに局部的に凹部を設けるとこの
部分はペーストが多く残るので加熱処理後低気孔率の層
が形成される。When the squeezing roll is locally provided with a concave portion, a large amount of paste remains in this portion, so that a layer having a low porosity is formed after the heat treatment.
【００１６】本発明によれば、このような操作によって
形成される低気孔率部分の気孔率は５０〜８０％とする
ことができるので、この部分にことさらペーストを厚く
塗布して電極基板の厚みを大きくすることなく、低多孔
度層を形成することができ、それにより電極基板の強度
を向上し電導度も改良することができる。以上の操作に
よる同一基板面内で気孔率の大きい部分と小さい部分が
連続した状態で形成される。これは不連続な境界を設け
ないものであり、応力集中を防ぐ効果もある。According to the present invention, since the porosity of the low porosity portion formed by such an operation can be 50 to 80%, the paste is thickly applied to this portion to make the thickness of the electrode substrate. It is possible to form a low-porosity layer without increasing the thickness, thereby improving the strength of the electrode substrate and improving the electrical conductivity. By the above operation, a portion having a large porosity and a portion having a small porosity are continuously formed in the same substrate surface. This does not provide discontinuous boundaries and also has an effect of preventing stress concentration.
【００１７】本発明において、気孔率の大きい部分と小
さい部分が連続した状態で形成されるのは、絞りロール
通過後、凹部に対応する部分のペーストを多く含む部位
から、その周囲に向かってペーストが供給されるので、
低気孔率部の周縁には気孔率が漸増しつつ高気孔率部に
連なる中間域が形成されるためでる。In the present invention, the portion having a large porosity and the portion having a small porosity are formed in a continuous state, that is, after passing through the squeeze roll, the paste corresponding to the concave portion is moved from the portion containing much paste to the periphery thereof. Is supplied,
This is because the low porosity portion has an intermediate region which is connected to the high porosity portion while the porosity is gradually increased at the periphery of the low porosity portion.
【００１８】また端子を溶接する場合には低気孔率層を
電極基板の端部に形成し、焼結後その部分を加圧するこ
とで強度をさらに向上させ端子の溶接時の破損を防ぐこ
とが可能になる。When terminals are welded, a low porosity layer is formed at the end of the electrode substrate, and after sintering, the portion is pressed to further improve the strength and prevent the terminals from being damaged during welding. It will be possible.
【００１９】本発明において、低気孔率部は絞りロール
の凹部により形成されるので、このロールの凹部の形状
やその配設位置を調整することにより、電池用電極基板
において任意の形状、及び位置に低気孔率部を設けるこ
とができる。In the present invention, the low porosity portion is formed by the concave portion of the squeeze roll. Therefore, the shape and position of the concave portion of the roll can be adjusted to adjust the shape and position of the battery electrode substrate. It is possible to provide a low porosity portion.
【００２０】図１に示すものは、本発明の電池用電極基
板の製造装置の概略図である。図１中、１はポリウレタ
ンフォームシートのロール、２はポリウレタンフォーム
シート、３はペースト液、４は絞りロール、５は巻き取
りロールである。FIG. 1 is a schematic view of an apparatus for manufacturing a battery electrode substrate according to the present invention. In FIG. 1, 1 is a roll of polyurethane foam sheet, 2 is a polyurethane foam sheet, 3 is a paste liquid, 4 is a squeezing roll, and 5 is a take-up roll.
【００２１】図２、３は絞りロールの例を示すもので、
図２はロールの円周全体に溝状凹部６を設けたもので、
また、図３は凹部をスポット的に配したものである。図
２のロールを使用した場合には、図４に示す構造をもつ
金属多孔体シートが得られる。また、図３の絞りロール
を使用した場合には図５に示す構造をもつ金属多孔体シ
ートが得られる。図４、５において７は高気孔率部、８
は凹部６によって形成された低気孔率部を表す。2 and 3 show examples of the squeeze rolls.
FIG. 2 shows a groove-shaped recess 6 provided on the entire circumference of the roll.
Further, FIG. 3 shows the concave portions arranged in spots. When the roll of FIG. 2 is used, a porous metal sheet having the structure shown in FIG. 4 is obtained. When the squeezing roll shown in FIG. 3 is used, a porous metal sheet having the structure shown in FIG. 5 is obtained. 4 and 5, 7 is a high porosity portion, 8
Represents a low porosity portion formed by the concave portion 6.
【００２２】図４に示すような金属多孔体シートは、例
えばフープ状で活物質を充填する場合に搬送時に負荷さ
れる荷重による変形や破損を防止することができ、ま
た、導電性も向上することができる。このような金属多
孔体シートを渦巻状電極に適用する場合は、図６に示す
ような形状に成形し、低気孔率部８をタブレスの端子取
り付け部などとする。また、図５に示すようなスポット
的に低気孔率部を形成した金属多孔体シートは、最終的
に図７に示すような形状に成形することでこの部分をリ
ード端子をスポット溶接する電極用に適している。また
連続凹部とスポット的凹部を組み合わせると図８のよう
な電極基体が得られる。また絞りロールに斜めに凹部を
設けかつスポット状凹部を用いると図９のような斜めに
低多孔度層を形成することもできる。とくに平板状で大
面積の電極で少ない低気孔率層で電導度を向上させるの
に適している。なお大量生産が前提なのでいずれも幅広
い発泡樹脂を用い、裁断により電極とする方法がよい。The porous metal sheet as shown in FIG. 4 can prevent deformation and damage due to a load applied during transportation when the active material is filled in a hoop shape, for example, and the conductivity is also improved. be able to. When such a porous metal sheet is applied to a spiral electrode, it is formed into a shape as shown in FIG. 6 and the low porosity portion 8 is used as a tabless terminal attachment portion or the like. In addition, the porous metal sheet having the spot-like low porosity portion as shown in FIG. 5 is finally formed into a shape as shown in FIG. Suitable for Further, an electrode substrate as shown in FIG. 8 can be obtained by combining the continuous concave portion and the spot concave portion. Further, when the squeezing roll is provided with a concave portion and a spot-like concave portion is used, a low porosity layer can be formed diagonally as shown in FIG. In particular, it is suitable for improving conductivity with a low porosity layer having a flat plate-shaped and large area electrode. Since it is premised on mass production, it is preferable to use a wide range of foamed resin and cut it into electrodes.
【００２３】[0023]
【実施例】以下に実施例を示し、本発明をさらに詳細に
説明する。The present invention will be described in more detail with reference to the following examples.
【００２４】実施例１ 平均粒子径２．８μｍのカーボニルニッケル粉末を５０
ｗｔ％、アクリル樹脂１０ｗｔ％、カルボキシメチルセ
ルロース２ｗｔ％、水３８ｗｔ％を用いてペーストとす
る。つぎに発泡状樹脂として、１インチ当たりの空孔数
が約５０個で厚さ１．８ｍｍ、幅６０ｃｍ、長さ１ｍの
ポリウレタンフォームを準備した。このポリウレタンフ
ォームを図１に示す装置によりペースト液中に浸漬とロ
ールによる余分なペーストを除く方法でポリウレタンフ
ォームにペーストを塗着した。Example 1 Carbonyl nickel powder having an average particle diameter of 2.8 μm was added to 50 parts.
A wt%, acrylic resin 10 wt%, carboxymethyl cellulose 2 wt%, and water 38 wt% are used to form a paste. Next, as the foamed resin, a polyurethane foam having about 50 pores per inch, a thickness of 1.8 mm, a width of 60 cm, and a length of 1 m was prepared. The polyurethane foam was applied to the polyurethane foam by a method shown in FIG. 1 in which the polyurethane foam was immersed in a paste solution and the excess paste was removed by a roll.
【００２５】その際、絞りロールは、図２に示す絞りロ
ールにおいて凹部６を中央部寄りに形成した形状のもの
を使用した。これにより幅６０ｃｍの発泡樹脂シートに
２０ｃｍ間隔で２本の凹部により幅１０ｍｍの低気孔率
層を２本形成した。ペースト塗着後乾燥し、水素気流中
で３０℃／ｍｉｎの昇温速度で１１００℃にし、１０分
間焼結した。これにより高気孔率層の気孔率平均９６
％、低気孔率層の気孔率７０％とした。これをＡとす
る。比較のために低気孔率層を設けていない基体をＢと
した。At this time, as the squeeze roll, the squeeze roll shown in FIG. 2 was used in which the concave portion 6 was formed near the center. As a result, two low porosity layers each having a width of 10 mm were formed on the foamed resin sheet having a width of 60 cm by two recesses at intervals of 20 cm. After the paste was applied, it was dried, heated to 1100 ° C. in a hydrogen stream at a temperature rising rate of 30 ° C./min, and sintered for 10 minutes. As a result, the average porosity of the high porosity layer is 96
%, And the porosity of the low porosity layer was 70%. This is designated as A. For comparison, a base material having no low porosity layer was designated as B.
【００２６】各支持体を用いてフープ状で（ニッケル
極）活物質を充填し、搬送による電極基体の破損状況を
比較した。市販の水酸化ニッケル粉末８７部、酸化コバ
ルト粉末８部、それに導電体としてニッケル粉末３部、
これにポリビニルアルコールの２（重量）％の水溶液を
ペーストとする、このペーストを加圧しながら金属多孔
体に充填した。これを搬送速度を変えて行った。Each support was used to fill a hoop-like (nickel electrode) active material, and the state of damage of the electrode substrate due to transportation was compared. 87 parts of commercially available nickel hydroxide powder, 8 parts of cobalt oxide powder, and 3 parts of nickel powder as a conductor,
A 2% (by weight) aqueous solution of polyvinyl alcohol was used as a paste, and the paste was filled into the porous metal body under pressure. This was performed by changing the transport speed.
【００２７】その結果８０ｍｍ／ｍｉｎの搬送速度まで
はいずれも破損など問題がなかったが、１６０ｍｍ／ｍ
ｉｎにするとＡでは異常がなかったが、Ｂでは平均で１
ｍ間隔で基体に破損部が生じた。２４０ｍｍ／ｍｉｎに
してもＡでは異常がなかったが、Ｂでは平均で３０ｃｍ
間隔で基体に破損部が生じた。As a result, there was no problem such as breakage up to a conveying speed of 80 mm / min, but 160 mm / m
When set to in, there was no abnormality in A, but in B the average was 1
The substrate was damaged at m intervals. There was no abnormality in A even at 240 mm / min, but in B it was 30 cm on average.
A breakage occurred on the substrate at intervals.
【００２８】実施例２ 図３の凹部６をスポット的に設けた絞りロールを使用し
て実施例１と同様にして図５のような低気孔率部を形成
し、また、同様に焼結して電極基板を得た後、この低気
孔率部分を加圧してリード端子をスポット溶接する電極
について述べる。深さ０．５ｍｍ、幅５ｍｍ、奥行１２
ｍｍの凹部を設けた絞りロールを用いて２枚の電極基体
とした。したがって裁断後の低気孔率部の大きさは幅５
ｍｍ、奥行６ｍｍである。Example 2 A low porosity portion as shown in FIG. 5 was formed in the same manner as in Example 1 by using a squeeze roll having spots provided with recesses 6 in FIG. 3, and was similarly sintered. An electrode for spot welding the lead terminals by pressurizing the low porosity portion after obtaining the electrode substrate will be described. Depth 0.5 mm, width 5 mm, depth 12
Two electrode bases were formed using a squeeze roll provided with a recess of mm. Therefore, the size of the low porosity portion after cutting is width 5
mm, depth 6 mm.
【００２９】なお、高気孔率部分の気孔率は９６％、低
気孔率部は５７％であった。この低気孔率部を５００ｋ
ｇ／ｃｍ2で加圧した。このようにして得られた電極基
体を幅３３ｍｍ、長さ１８０ｍｍに裁断した。The porosity of the high porosity portion was 96% and that of the low porosity portion was 57%. This low porosity part is 500k
Pressurized with g / cm 2 . The electrode substrate thus obtained was cut into a width of 33 mm and a length of 180 mm.
【００３０】この支持体を用いてニッケル極を製造し
た。実施例１と同様にして水酸化ニッケルを主とする活
物質を充填した。ペーストを充填後表面を平滑化し、そ
の後１２０℃で１時間乾燥した。得られた電極はエンボ
ス加工を施したロールプレス機を３回通して厚さ０．７
ｍｍに調整した、低気孔率部に厚さ０．２ｍｍ、幅５ｍ
ｍのニッケル板をスポット溶接により取り付けた。この
電極をＣとする。比較のために低気孔率部を設けていな
い例をＤとした。このスポット溶接時に本発明のＣでは
１００枚で１枚の溶接不良も生じなかった。しかしＤで
は８枚の端子部破損があり使用不能であった。A nickel electrode was produced using this support. In the same manner as in Example 1, an active material mainly containing nickel hydroxide was filled. After filling the paste, the surface was smoothed and then dried at 120 ° C. for 1 hour. The obtained electrode was passed through an embossing roll press machine three times to obtain a thickness of 0.7.
Adjusted to mm, the low porosity part has a thickness of 0.2 mm and a width of 5 m.
m nickel plate was attached by spot welding. This electrode is designated as C. For comparison, an example in which the low porosity portion was not provided was designated as D. At the time of this spot welding, with C of the present invention, no defective welding of 100 sheets occurred. However, in D, the terminal portion of 8 sheets was damaged and it was unusable.
【００３１】実施例３ 凹部６を斜めに連続とスポットを組み合わせて設けた絞
りロールを使用して実施例１と同様にして図９に示した
低気孔率部を形成し、また同様に焼結して電極基板を得
た後、低気孔率のスポット部を加圧してリード端子をス
ポット溶接する平板状電極について述べる。電極サイズ
は縦長さ２５０ｍｍ、横幅２００ｍｍ、厚さ０．７ｍｍ
とした。この上端部にスポット溶接用の幅１５ｍｍ、奥
行８ｍｍの、低気孔率部を設けた。またこの部分から下
部の逆の端に向けて幅３ｍｍの低気孔率層を設けた。な
お高気孔率部分の気孔率は９６％、低気孔率部は６７％
であった。スポット溶接用に低気孔率部を５００ｋｇ／
ｃｍ2で加圧した。Example 3 A low porosity portion shown in FIG. 9 was formed in the same manner as in Example 1 by using a squeeze roll in which concave portions 6 were obliquely provided by combining continuous spots and spots, and similarly sintered. A plate-like electrode in which a lead portion is spot-welded by pressurizing a spot portion having a low porosity after obtaining an electrode substrate will be described. The electrode size is 250 mm in length, 200 mm in width, 0.7 mm in thickness.
And A low porosity portion having a width of 15 mm and a depth of 8 mm for spot welding was provided on the upper end portion. Further, a low porosity layer having a width of 3 mm was provided from this portion toward the opposite end of the lower portion. The high porosity portion has a porosity of 96%, and the low porosity portion has a porosity of 67%.
Met. 500kg / low porosity part for spot welding
Pressurized with cm 2 .
【００３２】この支持体を用いてニッケル極を製造し
た。実施例１と同様にして水酸化ニッケルを主とする活
物質を充填した。ペーストを充填後表面を平滑化し、そ
の後１２０℃で１時間乾燥した。得られた電極は１トン
／ｃｍ2の圧力で加圧して厚さ０．７ｍｍに調整した。
低気孔率部の端子部に厚さ０．３ｍｍ、幅１３ｍｍのニ
ッケル板をスポット溶接により取り付けた。この電極を
Ｅとする。比較のために低気孔率部を設けていない例を
Ｆとした。A nickel electrode was produced using this support. In the same manner as in Example 1, an active material mainly containing nickel hydroxide was filled. After filling the paste, the surface was smoothed and then dried at 120 ° C. for 1 hour. The obtained electrode was pressed at a pressure of 1 ton / cm 2 to adjust the thickness to 0.7 mm.
A nickel plate having a thickness of 0.3 mm and a width of 13 mm was attached to the terminal portion of the low porosity portion by spot welding. Let this electrode be E. For comparison, an example in which the low porosity portion was not provided was designated as F.
【００３３】このニッケル極５枚と相手極として公知の
ＭｍＮｉ（ミッシュメタル）系水素吸蔵合金極５枚、親
水処理ポリプロピレン不織布セパレータを用いて角型密
閉形ニッケル−水素電池を構成した。電解液として比重
１．２５の苛性カリ水溶液に２５ｇ／ｌの水酸化リチウ
ムを溶解して用いた。A rectangular sealed nickel-hydrogen battery was constructed by using the five nickel electrodes, five known MmNi (Misch metal) type hydrogen storage alloy electrodes as counter electrodes, and a hydrophilic treated polypropylene nonwoven fabric separator. As an electrolytic solution, 25 g / l of lithium hydroxide was dissolved in a caustic potash aqueous solution having a specific gravity of 1.25 and used.
【００３４】まず各電池の放電電流１５Ａと１５０Ａの
際の放電電圧と容量を調べた。結果を表に示す。First, the discharge voltage and the capacity of each battery at discharge currents of 15 A and 150 A were examined. The results are shown in the table.
【００３５】[0035]
【表１】 [Table 1]
【００３６】この結果から明らかなように、Ｅはとくに
高放電特性が優れている。As is clear from these results, E is particularly excellent in high discharge characteristics.
【００３７】[0037]
【発明の効果】以上説明したように、本発明によれば、
基板の強度を要する部位を選択的に低気孔率部としたこ
とにより、その部位での変形、破損を防止することがで
きるとともに、電池特性、とくに高放電特性を向上させ
た電池用電極基板を得ることができる。As described above, according to the present invention,
By selectively making the portion of the substrate requiring low strength a low porosity portion, it is possible to prevent deformation and damage at that portion, and to provide an electrode substrate for a battery with improved battery characteristics, especially high discharge characteristics. Obtainable.
【図１】本発明の電池用電極基板の製造装置の概略説明
図、FIG. 1 is a schematic explanatory view of an apparatus for manufacturing a battery electrode substrate of the present invention,
【図２】本発明に用いる絞りロールの例を示す説明図、FIG. 2 is an explanatory view showing an example of a squeezing roll used in the present invention,
【図３】同、別の例を示す説明図、FIG. 3 is an explanatory view showing another example of the same.
【図４】金属多孔体のシートの一例を示す説明図、FIG. 4 is an explanatory view showing an example of a sheet of porous metal,
【図５】同、別の例を示す説明図、FIG. 5 is an explanatory view showing another example of the same.
【図６】図４の金属多孔体シートから成形した渦巻状電
極基板の一例を示す説明図、6 is an explanatory view showing an example of a spiral electrode substrate formed from the porous metal sheet of FIG.
【図７】図５の金属多孔体のシートから成形した電極基
板の説明図、FIG. 7 is an explanatory view of an electrode substrate formed from the sheet of porous metal of FIG.
【図８】金属多孔体シートのさらに別の例を示す説明
図、FIG. 8 is an explanatory view showing still another example of a porous metal sheet.
【図９】同、さらに別の例を示す説明図。FIG. 9 is an explanatory diagram showing still another example of the same.
Claims (7)
電極基板であって、選択的に低気孔率部分が配置された
金属多孔体から構成することを特徴とする電池用電極基
板。1. An electrode substrate for holding an active material used for a current collector for a battery, the electrode substrate for a battery comprising a porous metal body in which a low porosity portion is selectively arranged.
０〜８０％であり、その他の部分の気孔率が９０〜９７
％である請求項１記載の電池用電極基板。2. The porosity of the low porosity portion of the metal porous body is 5
0 to 80% and the porosity of other parts is 90 to 97
%, The battery electrode substrate according to claim 1.
分が連続していることを特徴とする請求項１記載の電池
用電極基板。3. The battery electrode substrate according to claim 1, wherein the low porosity portion of the porous metal body and the other portion are continuous.
ることを特徴とする請求項１記載の電池用電極基板。4. The battery electrode substrate according to claim 1, wherein the low porosity portion of the metal porous body is pressed.
もしくは金属化合物粉末と結着剤とを主成分としたペー
ストを含浸塗着した後、凹部を設けたロール間を通すこ
とで選択的に低気孔率部を形成せしめ、ついで金属が焼
結する温度以上で加熱してシート状の三次元網目状金属
多孔体とすることを特徴とする電池用電極基板の製造方
法。5. A skeleton of a porous resin core is impregnated with a paste containing a metal, an alloy or a metal compound powder and a binder as a main component, and then is passed between rolls having recesses. A method for producing a battery electrode substrate, characterized in that a low porosity portion is selectively formed and then heated at a temperature equal to or higher than a temperature at which a metal is sintered to form a sheet-like three-dimensional mesh-like metal porous body.
いた請求項５記載の電池用電極基板の製造方法。6. The method for manufacturing a battery electrode substrate according to claim 5, wherein the roll has a groove-shaped recess.
のを用いた請求項５記載の電池用電極基板の製造方法。7. The method of manufacturing an electrode substrate for a battery according to claim 5, wherein the roll has a spot-shaped recess.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6272290A JPH08138680A (en) | 1994-11-07 | 1994-11-07 | Electrode base plate for battery and manufacture thereof |
| US08/542,016 US6020089A (en) | 1994-11-07 | 1995-10-12 | Electrode plate for battery |
| CA002161287A CA2161287C (en) | 1994-11-07 | 1995-10-24 | Electrode plate for battery and process for producing the same |
| DE69520325T DE69520325T2 (en) | 1994-11-07 | 1995-11-06 | Battery electrode plate and process for its manufacture |
| TW084111744A TW561645B (en) | 1994-11-07 | 1995-11-06 | An electrode plate for use in cell |
| CN95118774A CN1077336C (en) | 1994-11-07 | 1995-11-06 | Electrode plate for battery and process for producing the same |
| TW087119835A TW425733B (en) | 1994-11-07 | 1995-11-06 | A method of manufacturing an electrode plate for use in cell |
| EP95117424A EP0710995B1 (en) | 1994-11-07 | 1995-11-06 | Electrode plate for battery and process for producing the same |
| KR1019950040009A KR960019832A (en) | 1994-11-07 | 1995-11-07 | Battery electrode substrate and its manufacturing method |
| US08/991,787 US5965298A (en) | 1994-11-07 | 1997-12-12 | Electrode plate for battery and process for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6272290A JPH08138680A (en) | 1994-11-07 | 1994-11-07 | Electrode base plate for battery and manufacture thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08138680A true JPH08138680A (en) | 1996-05-31 |
Family
ID=17511804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6272290A Pending JPH08138680A (en) | 1994-11-07 | 1994-11-07 | Electrode base plate for battery and manufacture thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08138680A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011154979A (en) * | 2010-01-28 | 2011-08-11 | Mitsubishi Materials Corp | Current collector for nonaqueous electrolyte secondary battery and electrode using the same, and method for manufacturing these |
| JP2011175934A (en) * | 2010-02-25 | 2011-09-08 | Mitsubishi Materials Corp | Collector for nonaqueous electrolyte secondary battery, electrode using the same, and method of manufacturing the collector and electrode |
| KR101355543B1 (en) * | 2011-02-09 | 2014-01-29 | (주)엘켐텍 | The electrochemical stack equipped with metal foam and method of metal foam |
-
1994
- 1994-11-07 JP JP6272290A patent/JPH08138680A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011154979A (en) * | 2010-01-28 | 2011-08-11 | Mitsubishi Materials Corp | Current collector for nonaqueous electrolyte secondary battery and electrode using the same, and method for manufacturing these |
| JP2011175934A (en) * | 2010-02-25 | 2011-09-08 | Mitsubishi Materials Corp | Collector for nonaqueous electrolyte secondary battery, electrode using the same, and method of manufacturing the collector and electrode |
| KR101355543B1 (en) * | 2011-02-09 | 2014-01-29 | (주)엘켐텍 | The electrochemical stack equipped with metal foam and method of metal foam |
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