JP3356181B2 - Manufacturing method of battery electrode - Google Patents
Manufacturing method of battery electrodeInfo
- Publication number
- JP3356181B2 JP3356181B2 JP03451992A JP3451992A JP3356181B2 JP 3356181 B2 JP3356181 B2 JP 3356181B2 JP 03451992 A JP03451992 A JP 03451992A JP 3451992 A JP3451992 A JP 3451992A JP 3356181 B2 JP3356181 B2 JP 3356181B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- active material
- ultrasonic vibration
- manufacturing
- horn
- 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.)
- Expired - Lifetime
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
- Battery Electrode And Active Subsutance (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、アルカリ蓄電池などに
用いられる電池用電極の製造法に関するものであって、
さらに詳しくは、三次元網目状構造等を有する金属多孔
体の電極基体に活物質を充填後、リード端子溶接部の活
物質を除去する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing an electrode for a battery used in an alkaline storage battery and the like,
More particularly, the present invention relates to a method for removing an active material at a lead terminal weld after filling an active material into a porous metal electrode base having a three-dimensional network structure or the like.
【0002】[0002]
【従来の技術】近年、電極のコスト低減と高エネルギー
密度化を図る目的で、90%以上の高多孔度を有し、か
つ三次元網目状構造を有する金属多孔体に、ペースト状
の活物質を充填する電極の製法が、実用化されている。
この種の電極基体となる金属多孔体は、高多孔度のため
機械的強度が弱く、直接リード端子として利用すること
が出来ない。このため別途用意した金属片を電極に溶接
してリード端子としなければならないが、電極に充填し
た電導性の乏しい活物質が障害となって、直接金属片を
溶接することは出来ない。従って、金属片を溶接する前
に所定部分の活物質を除去し、金属多孔体を露出する工
程が必要となる。2. Description of the Related Art In recent years, a paste-like active material has been added to a porous metal body having a high porosity of 90% or more and a three-dimensional network structure in order to reduce the cost and increase the energy density of an electrode. A method for producing an electrode that fills in has been put to practical use.
This kind of porous metal material serving as an electrode substrate has high mechanical strength due to high porosity and cannot be directly used as a lead terminal. For this reason, a separately prepared metal piece must be welded to the electrode to form a lead terminal. However, the active material having poor conductivity with which the electrode is filled becomes an obstacle, and the metal piece cannot be directly welded. Therefore, a step of removing a predetermined portion of the active material and exposing the porous metal body is required before welding the metal pieces.
【0003】従来、この種の活物質除去技術としては、
特開昭63−40253号公報や、特開平2−1865
57号公報に記載されているように、活物質充填後の電
極に垂直方向の超音波振動を加えて除去するものがあ
る。更に詳しくは、特開昭63−40253号公報に
は、三次元網目状金属多孔体の一種である金属繊維焼結
体を電極基体として用い、活物質充填後、プレスした電
極に垂直方向の超音波振動を加えて除去する方法が例示
されている。しかしながら、超音波加振時間に1〜2秒
要し、加振中ホーンまたはワークを移動する必要があ
り、さらに電極基体がニッケル繊維焼結体に限定され、
フェルト状ニッケルメッキ多孔体やスポンジ状ニッケル
多孔体には適用出来ないなど、生産性の低下や工程の複
雑化の問題があった。また、特開平2−186557号
には、活物質除去時に生じる電極基体の損傷分をカバー
するため、引張り破断強度3kg/cm以上で、かつ活物質
除去を容易にするため平均孔径200μm以上のスポン
ジ状ニッケル多孔体の電極基体に、活物質を充填後、超
音波振動により所定部所の活物質を除去し、次いで、前
記所定部所に集電タブを溶接する方法が例示されてい
る。しかしながら、スポンジ状ニッケル多孔体は、スポ
ンジ状プラスチックにニッケルメッキすることに依って
作られるが、平均孔径の下限値が決められているため、
引っ張り破断強度を上げる場合は、通常、メッキ厚さを
増加する必要がある。このため、ニッケル多孔体が高価
な物になるという問題があった。また、メッキ厚さが増
加し繊維径が太くなるため、円筒形電池に用いる場合な
どに短絡不良が発生し易い難点があった。Conventionally, this type of active material removal technology includes:
JP-A-63-40253 and JP-A-2-1865
As described in Japanese Patent Application Laid-Open No. 57-57, there is one in which an electrode after filling with an active material is removed by applying ultrasonic vibration in a vertical direction. More specifically, Japanese Patent Application Laid-Open No. 63-40253 discloses that a metal fiber sintered body, which is a kind of a three-dimensional mesh-like metal porous body, is used as an electrode substrate, filled with an active material, and then superposed in a direction perpendicular to a pressed electrode. A method of removing the object by applying sonic vibration is exemplified. However, it takes 1-2 seconds for the ultrasonic vibration time, it is necessary to move the horn or the work during the vibration, and the electrode substrate is limited to the nickel fiber sintered body,
This method cannot be applied to a felt-like nickel-plated porous body or a sponge-like nickel porous body. Japanese Patent Application Laid-Open No. 2-186557 discloses a sponge having a tensile breaking strength of 3 kg / cm or more in order to cover the damage to the electrode substrate caused when the active material is removed, and an average pore diameter of 200 μm or more in order to facilitate the removal of the active material. A method of filling a porous nickel electrode body with an active material, removing the active material in a predetermined portion by ultrasonic vibration, and then welding a current collecting tab to the predetermined portion is exemplified. However, a sponge-like nickel porous body is made by plating nickel on a sponge-like plastic, but since the lower limit of the average pore diameter is determined,
To increase the tensile breaking strength, it is usually necessary to increase the plating thickness. Therefore, there is a problem that the nickel porous body becomes expensive. In addition, since the plating thickness increases and the fiber diameter increases, there has been a problem that short-circuit failure easily occurs when used in a cylindrical battery.
【0004】なお、従来は図5のように超音波ホーンの
電極接触面が平滑であったため、垂直方向に超音波振動
を与えた場合、突き固める作用が伴い、活物質除去が円
滑に行なわれにくく、確実に活物質除去するためには電
極基体の損傷の原因となる長時間振動や強振動を与える
必要が生じた。このため、前述のように電極基体の強度
を上げる必要があった。Conventionally, as shown in FIG. 5, since the electrode contact surface of the ultrasonic horn is smooth, when ultrasonic vibration is applied in the vertical direction, the active material is removed smoothly with a compacting action. In order to remove the active material without fail, it is necessary to apply long-time vibration or strong vibration that causes damage to the electrode substrate. Therefore, it was necessary to increase the strength of the electrode substrate as described above.
【0005】[0005]
【発明が解決しようとする課題】本発明は、前記従来技
術の問題点を解決するものであって、引っ張り破断強度
を特別に上げたり、特定の電極基体を用いるなどのワー
クに対する制約を少なくし、安価で信頼性の高い電池用
電極の製造方法を提供するものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and is intended to reduce the restriction on the work such as specially increasing the tensile strength at break or using a specific electrode substrate. It is intended to provide an inexpensive and highly reliable method for producing a battery electrode.
【0006】[0006]
【課題を解決するための手段】本発明は、金属多孔体に
活物質を充填した後、端子溶接部分の活物質を垂直方向
の超音波振動を加えて除去する方法において、活物質除
去を効率的に行なうため、超音波振動ホーンの電極に接
する面に凹凸を設けるものである。SUMMARY OF THE INVENTION The present invention provides a method for removing an active material in a terminal welding portion by applying ultrasonic vibration in a vertical direction after the porous metal is filled with the active material. For this purpose, the surface of the ultrasonic vibration horn in contact with the electrode is provided with irregularities.
【0007】[0007]
【作 用】活物質除去を効率的に行なうためには、次の
2つの要件が必要である。即ち、活物質相互および金
属多孔体との結合を破壊すること。結合破壊によって
生成した活物質粉末を電極外へ速やかに放出すること。
特に、電極を加圧し活物質の充填密度を高めた後、活物
質除去する場合は、の要件を充たすことが有用であ
る。本発明は超音波ホーンの電極に接する面に凹凸を設
けてあるので、超音波振動を伴ってホーンを電極に接す
ると、先端部分の凸部で活物質を突き崩し、容易に粉末
状にすることができるため、の要件を満足することに
なる。また、生成した粉末は、ホーンの凹部より電極外
へ容易に放出されるため、の要件を満たすために効果
的である。[Operation] The following two requirements are necessary for efficient removal of active materials. That is, the bond between the active material and the porous metal is broken. To promptly release the active material powder generated by the bond breaking out of the electrode.
In particular, when the active material is removed after the electrode is pressurized to increase the packing density of the active material, it is useful to satisfy the requirement. Since the present invention has irregularities on the surface of the ultrasonic horn which is in contact with the electrode, when the horn is brought into contact with the electrode with ultrasonic vibration, the active material breaks down at the convex portion at the tip, and easily becomes powder. Can satisfy the requirements of. In addition, since the generated powder is easily released from the concave portion of the horn to the outside of the electrode, it is effective to satisfy the requirement.
【0008】[0008]
【実施例】本発明の実施例を図に基づいて説明する。図
1は本発明に用いる活物質除去装置の要部断面図、図2
はその要部拡大図である。1は引っ張り強度2〜3kg/
cmの金属多孔体に、水酸化ニッケルを主成分とする活物
質粉末を結合剤と共に混練したペーストを充填して乾燥
した後、加圧して得た活物質充填密度が約2.5g/c
c−voidの電極である。この電極1の所定端子取り
付け部を、直径1mmの多数の貫通孔5を有するアンビ
ル3の所定部分に設置し、該所定部分の周辺を所定部分
以外の活物質が損失しないように、押さえ板4に設けた
突起6で強圧した。そして、周波数20kHz、振幅7
5μmで電極1と垂直方向に超音波振動するホーン2
を、アンビル3との間隙が、0.1〜0.2mmに至る
まで降下させた。なお、ホーンは活物質に接する面に図
3または図4に示すようなピッチ0.8mm、深さ0.
4mmの凹凸を設けたものを用いた。凹凸のピッチおよ
び深さは、余り小さいと凹凸の効果がなく、逆に大き過
ぎると電極との接触面が減少して超音波振動の伝播が不
十分となって、活物質除去に支障を来す。実験の結果、
本実施例の前後の寸法が適当であった。また、約300
msの超音波加振中、超音波振動で粉砕された活物質粉
末は、アンビル3に設けた貫通孔5を通じて排出口7よ
り吸引除去した。こうして得られた電極の端子取り付け
部は、電極基体である金属多孔体の損傷も少なく、かつ
確実に所定部分の活物質が除去されており、端子の溶接
性は極めて良好であった。なお、加圧前の電極について
も、本実施例と同一ホーンを用いて活物質除去した結
果、同様な効果が確認された。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a main part of an active material removing apparatus used in the present invention, and FIG.
FIG. 1 is tensile strength 2-3kg /
cm of a porous material having a kneaded active material powder containing nickel hydroxide as a main component together with a binder, dried, and then pressed to obtain an active material packing density of about 2.5 g / c.
This is a c-void electrode. A predetermined terminal mounting portion of the electrode 1 is installed in a predetermined portion of the anvil 3 having a large number of through holes 5 having a diameter of 1 mm, and a pressing plate 4 is provided around the predetermined portion so that active material other than the predetermined portion is not lost. Was strongly pressed by the projections 6 provided on the substrate. And a frequency of 20 kHz and an amplitude of 7
Horn 2 oscillating ultrasonically in a direction perpendicular to electrode 1 at 5 μm
Was lowered until the gap with the anvil 3 reached 0.1 to 0.2 mm. The horn has a pitch of 0.8 mm and a depth of 0.1 mm as shown in FIG. 3 or 4 on the surface in contact with the active material.
The one provided with the unevenness of 4 mm was used. If the pitch and depth of the unevenness are too small, the effect of the unevenness will not be obtained. Conversely, if the pitch and the depth are too large, the contact surface with the electrode will be reduced and the propagation of ultrasonic vibration will be insufficient, which will hinder the removal of the active material. You. results of the experiment,
The dimensions before and after this example were appropriate. Also, about 300
The active material powder pulverized by the ultrasonic vibration during the ultrasonic vibration of ms was removed by suction from the outlet 7 through the through hole 5 provided in the anvil 3. In the terminal mounting portion of the electrode thus obtained, the metal porous body serving as the electrode substrate was hardly damaged, the active material in a predetermined portion was surely removed, and the weldability of the terminal was extremely good. As for the electrode before pressurization, the same effect was confirmed as a result of removing the active material using the same horn as in this example.
【0009】[0009]
【発明の効果】本発明によれば、機械的強度の弱い金属
多孔体からなる電極基体の損傷を抑え、確実かつ速やか
に端子溶接部の活物質を除去することが出来るので、安
価で信頼性の高い電池用電極が提供できる。According to the present invention, it is possible to suppress the damage to the electrode base made of a porous metal having low mechanical strength, and to remove the active material from the terminal weld portion reliably and quickly, thereby reducing the cost and reliability. And a battery electrode having a high density.
【図1】本発明に用いる活物質除去装置の要部断面図で
ある。FIG. 1 is a sectional view of a main part of an active material removing device used in the present invention.
【図2】本発明に用いる活物質除去装置の要部拡大断面
図である。FIG. 2 is an enlarged sectional view of a main part of an active material removing device used in the present invention.
【図3】本発明に用いるホーンの要部拡大図である。FIG. 3 is an enlarged view of a main part of a horn used in the present invention.
【図4】本発明に用いる他のホーンの要部拡大図であ
る。FIG. 4 is an enlarged view of a main part of another horn used in the present invention.
【図5】従来のホーンの要部拡大図である。FIG. 5 is an enlarged view of a main part of a conventional horn.
1 電極 2 ホーン 3 アンビル 4 押さえ板 5 貫通孔 6 突起 7 排気口 DESCRIPTION OF SYMBOLS 1 electrode 2 horn 3 anvil 4 holding plate 5 through hole 6 protrusion 7 exhaust port
Claims (1)
る金属多孔体に活物質を充填した後、端子溶接部分の活
物質を垂直方向の超音波振動を加えて除去することによ
って非焼結式(ペースト式)電極を製造する電池用電極
の製造法において、前記端子溶接部分の周囲を、該溶接
部分の周縁部と当接する箇所に線状もしくは帯状の突起
を設けた押え板で押圧し、電極との接触面に凹凸を設け
た超音波振動ホーンを端子溶接部分に当接して超音波振
動を加えることを特徴とする電池用電極の製造法。1. A method in which a porous metal body having a three-dimensional network or nonwoven fabric structure is filled with an active material, and the active material at a terminal welding portion is removed by applying ultrasonic vibration in a vertical direction .
Electrode for manufacturing non-sintered (paste) electrodes
In the manufacturing method of (1), the periphery of the terminal welding portion is pressed by a pressing plate provided with a linear or band-shaped projection at a position in contact with the peripheral portion of the welding portion, and an irregular surface is provided on the contact surface with the electrode. A method for manufacturing an electrode for a battery, comprising applying an ultrasonic vibration by contacting an ultrasonic vibration horn to a terminal welding portion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03451992A JP3356181B2 (en) | 1992-01-24 | 1992-01-24 | Manufacturing method of battery electrode |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP03451992A JP3356181B2 (en) | 1992-01-24 | 1992-01-24 | Manufacturing method of battery electrode |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05205735A JPH05205735A (en) | 1993-08-13 |
JP3356181B2 true JP3356181B2 (en) | 2002-12-09 |
Family
ID=12416517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP03451992A Expired - Lifetime JP3356181B2 (en) | 1992-01-24 | 1992-01-24 | Manufacturing method of battery electrode |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3356181B2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3557063B2 (en) * | 1997-01-10 | 2004-08-25 | 三洋電機株式会社 | Non-sintered nickel electrode for alkaline storage batteries |
ZA986942B (en) | 1997-08-08 | 1999-02-08 | Duracell Inc | Reinforced coiled electrode assemblies and methods of producing same |
KR100875108B1 (en) * | 2002-09-06 | 2008-12-22 | 삼성에스디아이 주식회사 | Secondary battery |
KR100889767B1 (en) * | 2002-09-23 | 2009-03-20 | 삼성에스디아이 주식회사 | Lithium secondary battery having protection plate |
CN102601079B (en) * | 2012-03-28 | 2014-04-30 | 珠海市光环自动化科技有限公司 | Full-automatic ultrasonic powder removing device for electrode plates |
-
1992
- 1992-01-24 JP JP03451992A patent/JP3356181B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH05205735A (en) | 1993-08-13 |
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