JP2002015722A - Alkaline storage battery - Google Patents
Alkaline storage batteryInfo
- Publication number
- JP2002015722A JP2002015722A JP2000199498A JP2000199498A JP2002015722A JP 2002015722 A JP2002015722 A JP 2002015722A JP 2000199498 A JP2000199498 A JP 2000199498A JP 2000199498 A JP2000199498 A JP 2000199498A JP 2002015722 A JP2002015722 A JP 2002015722A
- Authority
- JP
- Japan
- Prior art keywords
- current collecting
- electrode plate
- collecting terminal
- battery
- welding
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電動工具や、ハイ
ブリッド電気自動車（ＨＥＶ）電源用等の大電流での充
放電を必要とする用途に適したアルカリ蓄電池に関する
ものであって、電気的特性に優れかつ生産性の高い電池
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alkaline storage battery suitable for applications requiring a large current to be charged and discharged, such as a power tool or a hybrid electric vehicle (HEV) power supply, and to an electric storage device. And a highly productive battery.
【０００２】[0002]
【従来の技術】水素吸蔵合金を主材とした負極を用いた
密閉形アルカリ蓄電池は、優れた充放電特性と、環境等
の点から最近用途が拡大しつつある。中でも、電動工具
やＨＥＶ用電池等の大電流充放電用電源としての需要が
見込まれている。2. Description of the Related Art The use of a sealed alkaline storage battery using a negative electrode mainly composed of a hydrogen storage alloy has recently been expanding in terms of excellent charge / discharge characteristics and the environment. In particular, demand as a power source for large current charging / discharging such as electric tools and HEV batteries is expected.
【０００３】従来、焼結式正極を用いたアルカリ蓄電池
は、高率での充放電特性に優れるため、これらの大電流
用途における主流電池であった。大電流用途に使用され
る電池は、渦巻きまたは積層式極群を採用し電流密度を
下げている。また集電端子をインダイレクト溶接などで
溶着させるタブレス方式を採用して、集電効果を高めて
いる。Conventionally, alkaline storage batteries using a sintered positive electrode have been the mainstream batteries for these large current applications because of their excellent charge / discharge characteristics at high rates. Batteries used for high current applications employ a spiral or stacked electrode group to reduce current density. In addition, the current collecting terminal is welded by indirect welding or the like to adopt a tabless method to enhance the current collecting effect.
【０００４】しかし、焼結式正極の容量密度は４５０ｍ
Ａｈ／ｃｍ３程度であり、電池の容量を増加させること
には限界があった。一方、フェルト状またはスポンジ状
金属多孔体を基板とし、該基板に水酸化ニッケルを充填
する方法を用いた非焼結式正極では５５０ｍＡｈ／ｃｍ
３以上の容量密度が可能となり、ポータブル機器用の高
容量ニッケル水素蓄電池や高容量ニッケルカドミウム蓄
電池などに一般的に使用されている。最近では電気自動
車用のニッケル水素蓄電池などにも使用され始めてい
る。[0004] However, the capacity density of the sintered positive electrode is 450 m.
It is about Ah / cm3, and there is a limit to increasing the capacity of the battery. On the other hand, a non-sintered positive electrode using a method in which a felt-like or sponge-like porous metal body is used as a substrate and the substrate is filled with nickel hydroxide is 550 mAh / cm.
A capacity density of 3 or more is possible, and is generally used for high-capacity nickel-metal hydride storage batteries and high-capacity nickel-cadmium storage batteries for portable devices. Recently, nickel-metal hydride storage batteries for electric vehicles have begun to be used.
【０００５】前記のように、アルカリ蓄電池では集電端
子をタブレス方式により極板の端部に溶接する。該極板
端部は一般的に露出した基板から成る。非焼結式電極の
基板は前記金属多孔体である。上記の非焼結式正極を使
用した場合、焼結式電極を使用したものに比べて、集電
端子と基板との溶接箇所の電気抵抗が高いため、高率放
電特性に劣る欠点があった。As described above, in the alkaline storage battery, the current collecting terminal is welded to the end of the electrode plate by a tabless method. The plate ends generally comprise an exposed substrate. The substrate of the non-sintered electrode is the metal porous body. When the above-mentioned non-sintered positive electrode was used, there was a drawback that the high-rate discharge characteristics were inferior to those using the sintered electrode because the electric resistance of the welding portion between the current collecting terminal and the substrate was higher than that using the sintered electrode. .
【０００６】前記欠点改善のため、極板端部に帯状の活
物質未充填部分を設け、該活物質未充填部分に帯状のニ
ッケル板などを溶接した後に該極板端部に集電端子をシ
リーズ溶接するなどの提案（特開昭５６−８６４５９号
公報）がなされている。また、工程を簡略化する目的で
特開昭６２−１３９２５１号公報では、あらかじめ溶接
部を圧縮した発泡性基板を用いて、タブレス方式に於け
る集電端子の溶接強度を確保することができるとしてい
る。In order to improve the above-mentioned disadvantage, a strip-shaped active material-unfilled portion is provided at the end of the electrode plate, and a strip-shaped nickel plate or the like is welded to the active material-unfilled portion, and then a current collecting terminal is provided at the end of the electrode plate. Proposals such as series welding have been made (JP-A-56-86459). Further, for the purpose of simplifying the process, Japanese Patent Application Laid-Open No. Sho 62-139251 discloses that the welding strength of a current collecting terminal in a tabless system can be ensured by using a foamable substrate in which a welding portion is compressed in advance. I have.
【０００７】大電流での充放電を可能とするためには、
集電端子の厚みを大きくする、集電端子と極板間の溶接
点数を増やす、外部端子（円筒形電池においては電池蓋
部分に相当する）と集電端子間を接続するリード片の長
さを短くしたり、肉厚を厚くしたりして集電部分の電気
抵抗を低減する方法がある。To enable charging and discharging with a large current,
Increasing the thickness of the current collecting terminal, increasing the number of welding points between the current collecting terminal and the electrode plate, length of the lead piece connecting the external terminal (corresponding to the battery cover in the case of a cylindrical battery) and the current collecting terminal There is a method of reducing the electrical resistance of the current collecting portion by shortening the thickness or increasing the thickness.
【０００８】しかしながら、従来の溶接方法を用いた場
合、集電端子の厚みを厚くするとシリーズ溶接時の無効
電流を増加させることになり、溶接強度を高めることが
困難となる。また、従来の集電端子の構造で溶接点数を
増加させようとするのは、溶接回数が多くなるので実際
上困難である。また、リード片を短くしたり、肉厚を厚
くすることは集電端子と外部端子の接続を難しくする。
また、封口時にリード片が折り曲げられるため、リード
片の剛性が大きいとリード片と集電端子あるいは集電端
子と電極との溶着部が剥離するなどの問題が生じる。However, when the conventional welding method is used, an increase in the thickness of the current collecting terminal results in an increase in the reactive current during series welding, making it difficult to increase the welding strength. Further, it is practically difficult to increase the number of welding points in the conventional current collecting terminal structure because the number of weldings increases. In addition, shortening or increasing the thickness of the lead pieces makes connection between the current collecting terminal and the external terminal difficult.
Further, since the lead piece is bent at the time of sealing, if the rigidity of the lead piece is large, there arises a problem that the welded portion between the lead piece and the current collecting terminal or between the current collecting terminal and the electrode is peeled off.
【０００９】特開昭６１−３２３５３公報には、渦巻き
状極群を有するアルカリ蓄電池において集電体の下面に
放射状の突部を設け、該突部と極板端部を溶接すること
により極群と集電端子の溶接強度を高めることが提案さ
れている。また特開平１１−３１４９７公報には集電端
子の中央付近から外周縁部に至る切り欠き部複数個を放
射状に設け、該切り欠き部の縁部に下向きのリブ状突起
を設け、該リブ状突起が極板端部と交差しその一部分が
端部に食い込み複数点で溶接されている構造が提案され
ている。本提案によれば、強固な溶接が得られる点に於
いて優れている。本提案の場合リブ状突起の数を増せ
ば、その分溶接点数を増やせる利点がある。しかし、リ
ブ状突起の数に比例して多くの溶接回数を必要とする欠
点がある。前記公報によれば、正極および負極の基板は
焼結式ニッケル板や穿孔板、集電端子は鉄製鋼板で、い
ずれも硬質の材料である。そのため、極板端部と集電端
子が溶接されずに単に接触しているのみでは電気的導通
が確保されないため溶接が不可欠である。前記ＨＥＶ用
等大形電池においては極群が大形になるため、極板と集
電端子間に多数の電気的導通箇所を必要とする。大形電
池の場合、従来の集電構造では多数回の溶接を必要とし
た。従って、少ない溶接回数で集電端子と極板との電気
的導通箇所を多くできる集電構造が求められていた。Japanese Patent Application Laid-Open No. 61-32353 discloses an alkaline storage battery having a spiral electrode group, in which a radial projection is provided on the lower surface of the current collector and the projection and the end of the electrode plate are welded to each other. It has been proposed to increase the welding strength of the current collector terminal. In Japanese Patent Application Laid-Open No. 11-31497, a plurality of cutouts from the vicinity of the center of the current collecting terminal to the outer peripheral edge are provided radially, and a downward rib-like projection is provided at the edge of the cutout. There has been proposed a structure in which a projection intersects with an end of an electrode plate, and a part of the projection cuts into the end and is welded at a plurality of points. According to the present proposal, it is excellent in that a strong welding can be obtained. In the case of this proposal, there is an advantage that the number of welding points can be increased by increasing the number of rib-shaped projections. However, there is a disadvantage that a large number of weldings is required in proportion to the number of rib-shaped projections. According to the publication, the substrates of the positive electrode and the negative electrode are sintered nickel plates and perforated plates, and the current collecting terminals are iron steel plates, both of which are hard materials. Therefore, if the electrode plate end and the current collecting terminal are not welded but are merely in contact with each other, electrical continuity is not secured, so welding is indispensable. Since the electrode group becomes large in the above-mentioned HEV equal-size battery, a large number of electrically conductive portions are required between the electrode plate and the current collecting terminal. In the case of a large battery, the conventional current collecting structure required a large number of weldings. Therefore, there has been a demand for a current collecting structure capable of increasing the number of electrical conduction points between the current collecting terminal and the electrode plate with a small number of weldings.
【００１０】[0010]
【発明が解決しようとする課題】本発明はこのような課
題を解決するために、電池内部の集電構造を改良するこ
とによって、集電端子と極群の溶接が少ない回数で済
み、かつ集電機能に優れた大電流充放電が可能なアルカ
リ蓄電池を実現しようとするものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention improves the current collecting structure inside the battery, so that the number of weldings between the current collecting terminal and the electrode group can be reduced. An object of the present invention is to realize an alkaline storage battery which is excellent in electric function and capable of charging and discharging a large current.
【００１１】[0011]
【課題を解決するための手段】本発明は前記の課題を解
決するため、渦巻き式又は積層式極群の相対向する外面
に突出した正極板端部および負極板端部に集電端子を溶
接して成るアルカリ蓄電池に於いて、少なくとも一方の
極板端部はフェルト状またはスポンジ状金属多孔体であ
り、該極板端部に溶接される集電端子がスリットおよび
極群に面する側にリブ状突起を有し、該集電端子の前記
スリットを挟む平面部と極板端部が溶接されて成るとと
もに、前記リブ状突起が極板端部と交差しかつ食い込ん
で接触している構造としたアルカリ蓄電池である。本構
造によれば、集電端子平面部と極板端部の溶接箇所の
他、溶接されてないリブ状突起と極板端部の接触箇所も
電気的な導通を有する。該接触箇所で電気的導通を確保
するので、溶接回数を増やさなくてもリブ状突起の数を
増やすのみで導通箇所を多くすることができる。従っ
て、少ない溶接回数で多くの導通箇所を確保できるの
で、特に大形極板の集電に有効である。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention welds a current collecting terminal to an end of a positive electrode plate and an end of a negative electrode plate protruding from opposed outer surfaces of a spiral or stacked electrode group. In at least one of the electrode ends is a felt-like or sponge-like porous metal body, and the current-collecting terminal welded to the electrode end faces the slit and the side facing the electrode group. A structure having a rib-like projection, wherein a flat portion sandwiching the slit of the current collecting terminal and an end of the electrode plate are welded, and the rib-like projection intersects and bites into the electrode plate end to make contact therewith. This is an alkaline storage battery. According to this structure, in addition to the welding portion between the current collector terminal flat portion and the end portion of the electrode plate, the contact portion between the unwelded rib-shaped projection and the end portion of the electrode plate also has electrical conduction. Since electrical conduction is ensured at the contact points, the number of conductive points can be increased by merely increasing the number of rib-shaped projections without increasing the number of weldings. Therefore, a large number of conductive portions can be secured with a small number of weldings, which is particularly effective for collecting current of a large electrode plate.
【００１２】後述の如く、本発明によれば、前記溶接箇
所は集電端子の平面部に設けられたスリットを挟む箇所
のみである。従って本発明に係る集電構造は溶接回数が
少なくて済みかつ集電効果の高い構造である。ここでい
う高い集電効果とは極板の基板および集電端子を含む集
電体の電気抵抗が小さいことは無論であるが、むしろ１
枚の極板内および複数の極板間に集電体の電気抵抗に差
がないことを指す。このことは充放電の際の電流分布が
均一に保たれるための必要条件である。電流分布が均一
に保たれれば、高率で放電した場合でも高い活物質利用
率が得られる。そのためには集電端子と極板の基板との
電気的接触点が多く、且つ該接触点が偏らずに分布して
いることが求められるが、本発明はそれに合致するもの
である。As will be described later, according to the present invention, the welding portion is only a portion sandwiching a slit provided in the flat portion of the current collecting terminal. Therefore, the current collecting structure according to the present invention requires less welding and has a high current collecting effect. The high current collecting effect referred to herein means that the electric resistance of the current collector including the electrode plate substrate and the current collecting terminal is small, but it is rather 1%.
It means that there is no difference in electric resistance of the current collector within one electrode plate and between the plurality of electrode plates. This is a necessary condition for maintaining a uniform current distribution during charging and discharging. If the current distribution is kept uniform, a high active material utilization rate can be obtained even when discharging at a high rate. For this purpose, it is required that there are many electrical contact points between the current collecting terminal and the substrate of the electrode plate, and that the contact points are distributed without bias, but the present invention meets this requirement.
【００１３】本発明によれば集電端子と極板端部との間
で強固な溶接強度が得られる。本発明の場合極板端部に
溶接しようとする集電端子の平面部にスリットを配置し
ている。該スリットを挟んで両側に溶接器の電極を当接
して溶接することにより無効電流を抑制し、溶接電流を
高めることができる。このため溶接に不利な平面であっ
ても良好な溶接が得られる。集電端子突起と極板端部の
溶接は点での溶接であり、極板端部がフェルト状または
スポンジ状金属多孔体の場合には溶接箇所の機械的強度
が弱いのに対して、本発明のように同基板端部と集電端
子平面との溶接は面での溶接なので機械的強度が強く、
衝撃や振動が加わった場合にも溶接箇所がはずれ難い利
点がある。According to the present invention, a strong welding strength can be obtained between the current collecting terminal and the end of the electrode plate. In the case of the present invention, a slit is arranged in a plane portion of the current collecting terminal to be welded to the end of the electrode plate. By welding the electrodes of the welder on both sides with the slit interposed therebetween, the reactive current can be suppressed and the welding current can be increased. Therefore, good welding can be obtained even on a plane which is disadvantageous for welding. The welding between the current collector terminal protrusion and the end of the electrode plate is welding at a point.When the end of the electrode plate is a felt-like or sponge-like porous metal body, the mechanical strength of the welded part is weak, As in the invention, the end of the substrate and the current collecting terminal plane are welded on the surface, so the mechanical strength is strong,
There is an advantage that the welded portion is unlikely to come off even when shock or vibration is applied.
【００１４】本発明は更に、前記集電端子のリブ状突起
と極板端部が略垂直に交差している構造である。極板端
面とリブ状突起が略垂直に交差していると、突起が小さ
い応力で極板端部に食い込むため突起が変形せず、良好
な食い込み状態が得られる。該食い込み箇所は溶接され
ずに接触しているのみであるが、電気的導通が良好であ
る。従って本構造によれば、前記溶接箇所以外に基板と
集電端子との電気的導通の良好な接触箇所を得ることが
できる。渦巻き式又は積層式極群に於いては、集電端子
のリブ状突起と極板との接触箇所は多い。またリブ状突
起を均等に配置することにより、前記接触箇所を極板の
長さ方向に対して均等に配置することが可能である。こ
のため、前記の高い集電効果が得られる。The present invention further has a structure in which the rib-like projections of the current collecting terminals and the ends of the electrode plates intersect substantially vertically. When the end face of the electrode plate and the rib-shaped protrusion intersect substantially perpendicularly, the protrusion bites into the end portion of the electrode plate with a small stress, so that the protrusion is not deformed and a good biting state is obtained. The biting portions are in contact with each other without welding, but have good electrical continuity. Therefore, according to the present structure, it is possible to obtain a contact portion having good electrical continuity between the substrate and the current collecting terminal, in addition to the welding portion. In the spiral or stacked electrode group, there are many contact points between the rib-shaped projections of the current collecting terminal and the electrode plate. Further, by arranging the rib-like projections evenly, it is possible to arrange the contact portions evenly in the length direction of the electrode plate. Therefore, the above-mentioned high current collecting effect can be obtained.
【００１５】本発明の場合、正極板と負極板の中少なく
とも一方の基板は、ニッケル等の金属繊維マットから成
るフェルト状又は発泡体から成るスポンジ状金属多孔体
であって、集電端子と溶接される側の極板端部は、活物
質が未充填であり前記基板が露出している。活物質が未
充填状態の前記多孔体は柔軟で弾性に富む。従って、前
記リブ状突起が基板に無理無く食い込むことにより、両
者の接触箇所で電気的導通が確保される。活物質が充填
された基板は柔軟性、弾性共に喪失するので好ましくな
い。In the case of the present invention, at least one of the positive electrode plate and the negative electrode plate is a sponge-like metal porous body made of a felt or foam made of a metal fiber mat of nickel or the like. The end of the electrode plate on the side to be filled is not filled with the active material, and the substrate is exposed. The porous body not filled with the active material is flexible and rich in elasticity. Therefore, the rib-like projections can bite into the substrate without difficulty, so that electrical continuity is ensured at the contact points between the two. The substrate filled with the active material is not preferable because both the flexibility and the elasticity are lost.
【００１６】[0016]
【発明の実施の形態】本発明に係る集電構造は、少なく
ても一方の極板を構成する基板が前記フェルト状または
スポンジ状金属多孔体である電池に対して適用される。
アルカリ蓄電池の場合、一般適に前記金属多孔体は正極
の基板に適用され、負極の基板には穿孔板が適用される
ことが多い。従って本発明は少なくとも正極の集電構造
に適用される。ここでは正極の集電構造に限って記述す
るが、負極の基板が前記金属多孔体である場合、本発明
は負極の集電構造に対しても有効である。BEST MODE FOR CARRYING OUT THE INVENTION The current collecting structure according to the present invention is applied to a battery in which the substrate constituting at least one of the electrodes is the felt-like or sponge-like porous metal body.
In the case of an alkaline storage battery, the porous metal body is generally suitably applied to a positive electrode substrate, and a perforated plate is often applied to a negative electrode substrate. Therefore, the present invention is applied to at least the current collecting structure of the positive electrode. Here, the description is limited to the current collecting structure of the positive electrode. However, when the substrate of the negative electrode is the porous metal body, the present invention is also effective for the current collecting structure of the negative electrode.
【００１７】本発明に係るアルカリ蓄電池に於ける正極
は前記非焼結式正極である。帯状の正極、セパレータお
よび負極の積層体が巻き込まれた渦巻き式かまたは矩形
の正極、セパレータおよび負極が複数枚積層された積層
式極群を有する。該極群を構成する正極板は繊維状ニッ
ケルマットまたは発泡状ニッケル製基板に活物質が充填
されている。極板長手方向の片側端部には、帯状に活物
質未充填部分が形成され、基板が露出している。基板が
露出した正極板の端部に集電端子が溶接されている。The positive electrode in the alkaline storage battery according to the present invention is the non-sintered positive electrode. It has a spiral type in which a laminate of a band-shaped positive electrode, a separator and a negative electrode is wound, or a stacked type electrode group in which a plurality of rectangular positive electrodes, separators and negative electrodes are laminated. In the positive electrode plate constituting the electrode group, a fibrous nickel mat or a foamed nickel substrate is filled with an active material. At one end in the longitudinal direction of the electrode plate, an active material-unfilled portion is formed in a band shape, and the substrate is exposed. A current collecting terminal is welded to the end of the positive electrode plate where the substrate is exposed.
【００１８】前記集電端子はスリットおよび極群に面す
る側にリブ状突起を有している。極板端部と前記集電端
子のスリットを挟む平面部が溶接されている。極板端部
と前記リブ状突起は交差し、かつリブ状突起は極板端部
に食い込んでいる。前記集電端子に配置されたスリット
は、溶接工程において溶接電流値を高める役割を果た
す。すなわち、溶接機の２本の電極を、前記スリットを
挟んで対峙させて溶接することにより、無効電流が抑え
られ、溶接電流値が高められるので良好な溶接が得られ
る。従ってスリットのない場合に比べ溶接箇所が少なく
て済む、本発明においては溶接は集電端子のスリットを
挟む平面部においてのみ行われる。そのため溶接回数は
少なくて済む。The current collecting terminal has a rib and a rib-like projection on the side facing the slit and the pole group. An end portion of the electrode plate and a flat portion sandwiching the slit of the current collecting terminal are welded. The end of the electrode plate and the rib-like protrusion intersect, and the rib-like protrusion cuts into the end of the electrode plate. The slit arranged in the current collecting terminal plays a role in increasing a welding current value in a welding process. That is, by welding the two electrodes of the welding machine so as to face each other with the slit interposed therebetween, the reactive current is suppressed and the welding current value is increased, so that good welding is obtained. Therefore, the number of welding points is smaller than that in the case where there is no slit. In the present invention, welding is performed only on a flat portion sandwiching the slit of the current collecting terminal. Therefore, the number of weldings can be reduced.
【００１９】極板端部と前記リブ状突起は略垂直に交差
している。前記のようにリブ状突起は極板端部に食い込
んでいる。該交差部の中には、極板端部とリブ状突起が
弱く溶接されている例も認められる。これは意図して溶
接したものでは無いが、前記極板端部と集電端子との溶
接工程において、前記交差部に漏れ電流が流れたために
溶接されたものと推定される。交差部が単なる接触ある
いは弱い溶接の何れの場合であっても、該交差部におい
て基板と集電端子との間に良好な電気的導通が得られ
る。このため少ない溶接回数で高い集電効果が達成でき
る。The end of the electrode plate and the rib-like projection intersect substantially vertically. As described above, the rib-like projections bite into the end portions of the electrode plate. In the intersecting portion, an example in which the end portion of the electrode plate and the rib-like projection are weakly welded is also recognized. Although this was not intentionally welded, it is presumed that in the welding step between the electrode plate end and the current collecting terminal, welding was performed due to leakage current flowing through the intersection. Regardless of whether the intersection is a mere contact or a weak welding, good electrical continuity is obtained between the substrate and the current collecting terminal at the intersection. Therefore, a high current collecting effect can be achieved with a small number of weldings.
【００２０】[0020]
【実施例】以下、本発明の１実施例を図面に基づいて説
明する。なお、本発明の形状、寸法等は以下に示した例
に限定されるものではない。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. Note that the shape, dimensions, and the like of the present invention are not limited to the examples shown below.
【００２１】図１は本発明に係る円筒形電池の正極集電
端子の１例を示す斜視図である。該集電端子１は厚さ４
μｍのニッケルメッキが施された鉄製である。集電端子
１は直径が２８ｍｍφ、厚さが０．５ｍｍの円盤状で、
図の１ａに示すように幅２ｍｍのスリットが存在する。
スリット１ａの両側にはリブ状突起１ｂがある。リブ状
突起１ｂは高さが約０．５ｍｍであり、図のように先端
が尖っている。リブ状突起の高さは極板上端部に設けら
れた帯状の活物質未充填部の幅０．５〜２．０ｍｍより
小さくなければならない。前記リブ状突起が極板端部に
容易に食い込み、極板と集電端子間に良好な電気的導通
が得られるためには、リブ状突起の高さが０．２〜１ｍ
ｍであって先端が尖っていることが望ましい。また、図
の例では平面部１ｄに溶接効果を高めるため幅１ｍｍ、
長さ４ｍｍのスリット１ｃが設けられている。FIG. 1 is a perspective view showing an example of a positive electrode current collecting terminal of a cylindrical battery according to the present invention. The current collecting terminal 1 has a thickness of 4
It is made of iron with a nickel plating of μm. The current collecting terminal 1 is a disk having a diameter of 28 mmφ and a thickness of 0.5 mm,
As shown in FIG. 1a, there is a slit having a width of 2 mm.
There are rib-shaped protrusions 1b on both sides of the slit 1a. The rib-like projection 1b has a height of about 0.5 mm and has a sharp tip as shown in the figure. The height of the rib-like projections must be smaller than the width of the band-shaped active material-unfilled portion provided at the upper end of the electrode plate, 0.5 to 2.0 mm. In order for the rib-like projection to easily bite into the end of the electrode plate and to obtain good electrical conduction between the electrode plate and the current collecting terminal, the height of the rib-like protrusion is 0.2 to 1 m.
m and the tip is desirably sharp. In the example shown in the figure, the flat portion 1d has a width of 1 mm to enhance the welding effect.
A slit 1c having a length of 4 mm is provided.
【００２２】図２（Ａ）は本発明に係る角形電池の正極
集電端子２の斜視図である。該集電端子は厚さ４μｍの
ニッケルメッキが施された鉄製である。集電端子２は幅
１２ｍｍ、長さ１００ｍｍ、厚さ０．５ｍｍの矩形板
で、図の２ａに示すように幅５ｍｍ、長さ１０ｍｍのス
リットがある。スリット２ａの両側にはリブ状突起２ｂ
がある。図１に示した円筒形電池の集電端子と同様、集
電端子の平面部２ｄにスリット２ｃが設けられている。
図２（Ｂ）は図２（Ａ）の一点鎖線Ａ−Ａ´で切断した
断面図である。リブ状突起２ｂは高さが０．５ｍｍであ
り、先端が尖った形状であることを示す。FIG. 2A is a perspective view of the positive electrode current collecting terminal 2 of the prismatic battery according to the present invention. The current collecting terminal is made of 4 μm thick nickel-plated iron. The current collecting terminal 2 is a rectangular plate having a width of 12 mm, a length of 100 mm, and a thickness of 0.5 mm, and has a slit of 5 mm in width and 10 mm in length as shown in FIG. Rib-shaped protrusions 2b on both sides of slit 2a
There is. Similar to the current collecting terminal of the cylindrical battery shown in FIG. 1, a slit 2c is provided in the flat portion 2d of the current collecting terminal.
FIG. 2B is a cross-sectional view taken along a dashed line AA ′ in FIG. The rib-shaped projection 2b has a height of 0.5 mm, which indicates that the tip is sharp.
【００２３】図３は本発明に係る円筒形電池用正極集電
端子の別の例を示す斜視図である。集電端子３は、図１
に示した例同様直径が２８ｍｍ、厚さが０．５ｍｍの円
盤状で、Ｖ字状のリブ状突起３ｂを有する。該リブ状突
起は高さが約０．５ｍｍであり、図のように先端が尖っ
ていることが望ましい。リブ状突起の高さは図１に示し
た１ｂ同様０．２〜１ｍｍが適当である。また平面部３
ｄには溶接効果を高めるためのスリット３ｃが配置され
ている。FIG. 3 is a perspective view showing another example of the positive electrode current collector terminal for a cylindrical battery according to the present invention. The current collecting terminal 3 is shown in FIG.
As in the example shown in FIG. 7, the disk-shaped V-shaped rib-shaped projection 3b having a diameter of 28 mm and a thickness of 0.5 mm is provided. It is desirable that the rib-like projections have a height of about 0.5 mm and have sharp tips as shown in the figure. The height of the rib-shaped projection is suitably 0.2 to 1 mm as in 1b shown in FIG. Also, the flat part 3
A slit 3c for enhancing the welding effect is arranged at d.
【００２４】図４は比較のために示した、従来の円筒形
電池用正極集電端子４の平面図である。厚さ０．３ｍｍ
のニッケル製で、直径が２８ｍｍφの円盤状である。FIG. 4 is a plan view of a conventional positive electrode current collector terminal 4 for a cylindrical battery, shown for comparison. 0.3mm thick
It is made of nickel and has a disk shape of 28 mmφ in diameter.
【００２５】図５は比較のために示した、従来の角形電
池用正極集電端子５の平面図である。厚さ０．３ｍｍの
ニッケル製で、幅が１２ｍｍ、長さが１００ｍｍの矩形
板である。FIG. 5 is a plan view of a conventional positive electrode current collector terminal 5 for a rectangular battery, shown for comparison. It is a rectangular plate made of nickel having a thickness of 0.3 mm, a width of 12 mm and a length of 100 mm.
【００２６】図６は円筒形アルカリ蓄電池の渦巻き状極
群６の上面に集電端子１が取り付けられた状態を示す説
明図である。渦巻き状極群６の上面に正極板端部６ａが
突出しており、該正極板端部６ａに集電端子１が溶接さ
れている。スリット１ｃの両側に位置する黒点６ｂに溶
接機の電極が当接され抵抗溶接される。これによって正
極板端面６ａと集電端子１のスリット１ｃを挟む平面が
溶接される。本例では溶接点が６点で、溶接回数は３回
である。FIG. 6 is an explanatory view showing a state in which the current collecting terminal 1 is mounted on the upper surface of the spirally wound electrode group 6 of the cylindrical alkaline storage battery. A positive electrode plate end 6a protrudes from the upper surface of the spiral electrode group 6, and the current collecting terminal 1 is welded to the positive electrode plate end 6a. Electrodes of the welding machine are brought into contact with black spots 6b located on both sides of the slit 1c, and resistance welding is performed. Thereby, the flat plate sandwiching the end face 6a of the positive electrode plate and the slit 1c of the current collecting terminal 1 is welded. In this example, the number of welding points is six and the number of welding times is three.
【００２７】図７は図６に示した集電端子付きの極群を
真上から見た説明図である。前記正極板端部６ａを波線
で表した。スリット１ａの両側に設けられたリブ状突起
１ｂは円の中心から略放射状に伸びており、渦巻き状の
極板端部６ａと略垂直に交差接触している。前記の如
く、極板上端部は活物質未充填であり、柔らかくて柔軟
性のある繊維状又は発泡のニッケル製の多孔質基板であ
る。尖った先端を有するリブ状突起１ｂは該正極板端部
６ａに食い込むため、正極集電端子と正極板端部は良好
に接触する。FIG. 7 is an explanatory view of the pole group with a current collecting terminal shown in FIG. 6 as viewed from directly above. The positive electrode plate end 6a is represented by a wavy line. The rib-like projections 1b provided on both sides of the slit 1a extend substantially radially from the center of the circle, and substantially perpendicularly cross-contact with the spiral electrode plate end 6a. As described above, the upper end portion of the electrode plate is not filled with an active material, and is a soft and flexible fibrous or foamed nickel porous substrate. Since the rib-shaped protrusion 1b having a sharp tip bites into the positive electrode plate end 6a, the positive current collector terminal and the positive electrode plate end are in good contact with each other.
【００２８】図８は円筒形電池における極群６／正極集
電端子１／金属リード片９／電池蓋８ｃ（正極端子を兼
ねる）の接続構造を説明するための図であって、電槽に
収納される以前の極群を横から見た図である。正極集電
端子１電池蓋８ｃは金属リード片９により接続されてい
る。図のようにリード片９は湾曲しているので、正極集
電端子１に対してもリード片の剛性に応じた応力が加わ
るが、正極集電端子と正極板端部の溶接強度が高いため
溶接がはずれる虞は無い。正極８ａは絶縁板、８ｂはガ
スケット、８ｄはガス排出弁である。図では省略した
が、正極集電端子が溶接された極群の上面と対向する下
面には負極板端部が突出しており、該負極板端部に負極
集電端子が溶接される。FIG. 8 is a view for explaining the connection structure of the electrode group 6 / positive electrode current collecting terminal 1 / metal lead piece 9 / battery lid 8c (also serving as the positive electrode terminal) in the cylindrical battery. It is the figure which looked at the pole group before being stored from the side. The positive electrode current collecting terminal 1 and the battery lid 8c are connected by a metal lead piece 9. As shown in the figure, since the lead piece 9 is curved, a stress corresponding to the rigidity of the lead piece is also applied to the positive current collecting terminal 1, but the welding strength between the positive current collecting terminal and the end of the positive electrode plate is high. There is no risk that the welding will come off. The positive electrode 8a is an insulating plate, 8b is a gasket, and 8d is a gas discharge valve. Although not shown in the figure, an end of the negative electrode plate protrudes from the lower surface opposite to the upper surface of the electrode group to which the positive electrode current collector terminal is welded, and the negative electrode current collector terminal is welded to the end of the negative electrode plate.
【００２９】図９は集電端子と外部端子とを接続するた
めの前記金属リ−ド片９の平面図である。本リード片９
は幅が１５ｍｍ、長さが２０ｍｍ、厚さが０．５ｍｍの
ニッケル板を加工したものであり、黒点９ａで示した溶
接用プロジェクションが設けられている。また２つのプ
ロジェクションの間に溶接効果を高めるためのスリット
９ｂを有する。FIG. 9 is a plan view of the metal lead piece 9 for connecting a current collecting terminal and an external terminal. This lead piece 9
Is obtained by processing a nickel plate having a width of 15 mm, a length of 20 mm and a thickness of 0.5 mm, and is provided with a welding projection indicated by a black spot 9a. In addition, there is a slit 9b for enhancing the welding effect between the two projections.
【００３０】図１０は積層式の極群を有する角形電池に
おける集電端子と極板との接続構造を示す説明図で、極
群を横から見た図である。正極集電端子２は極群左側の
正極板端部１０aに溶接されている。該正極板端部は活
物質未充填の繊維状ニッケルマット又は発泡状ニッケル
基板製である。正極集電端子のリブ状突起２bは極板端
部１０ａと略垂直に交差接触し食い込んでいる。従って
円筒形電池同様正極集電端子と正極板端部は良好に接触
する。正極集電端子と対向する極群右側には負極板１０
cの端部１０dが突出しており、該端面に負極集電端子１
０ｂが溶接されている。１０eは正極板と負極板の間に
狭持されたセパレータである。FIG. 10 is an explanatory view showing a connection structure between a current collecting terminal and an electrode plate in a prismatic battery having a stacked electrode group, and is a view of the electrode group as viewed from the side. The positive electrode current collecting terminal 2 is welded to the positive electrode plate end 10a on the left side of the electrode group. The end of the positive electrode plate is made of a fibrous nickel mat or a foamed nickel substrate not filled with an active material. The rib-shaped projection 2b of the positive electrode current collecting terminal crosses and penetrates the electrode plate end 10a substantially perpendicularly. Therefore, similarly to the cylindrical battery, the positive electrode current collector terminal and the end of the positive electrode plate are in good contact. A negative electrode plate 10 is provided on the right side of the electrode group facing the positive electrode current collecting terminal.
c has an end 10d protruding therefrom.
0b is welded. 10e is a separator sandwiched between the positive electrode plate and the negative electrode plate.
【００３１】（実施例１）ニッケルの一部を亜鉛及びコ
バルトで置換した高密度水酸化ニッケルの表面にコバル
ト酸化物を被覆した活物質を３次元の発泡状ニッケル基
板に充填し、高さ５０ｍｍ、長さ６５０ｍｍ、厚み０．
４６ｍｍの正極板（公称容量８Ａｈ）を作製した。一
方、水素吸蔵合金を主体とする活物質をニッケルメッキ
パンチング鋼板に塗着し、高さ５０ｍｍ、長さ７２０ｍ
ｍ、厚み０．３３ｍｍの負極板（公称容量１４Ａｈ）を
作製した。正極板端部が極群の上面に突出するように、
正極板と負極板とを高さ方向に１．５ｍｍずらした状態
で不織布を介して円筒形に巻きこみ、最外周をテープに
より固定した電極群を作製した。この極群の正極板の上
側端部には、幅１．５ｍｍの活物質未充填部分が設けら
れている。他方極群の下面に突出した負極板の下側端部
にも活物質未充填部分が設けられている。Example 1 A three-dimensional foamed nickel substrate was filled with an active material in which the surface of a high-density nickel hydroxide in which a part of nickel was replaced with zinc and cobalt was coated with cobalt oxide, and the height was 50 mm. , Length 650 mm, thickness 0.
A 46 mm positive electrode plate (nominal capacity 8 Ah) was produced. On the other hand, an active material mainly composed of a hydrogen storage alloy is applied to a nickel-plated punched steel plate, and is 50 mm in height and 720 m in length.
A negative electrode plate (nominal capacity: 14 Ah) having a thickness of 0.33 mm was prepared. As the end of the positive electrode plate protrudes from the top of the electrode group,
The positive electrode plate and the negative electrode plate were wound in a cylindrical shape via a nonwoven fabric in a state of being shifted by 1.5 mm in the height direction, and an electrode group having the outermost periphery fixed with a tape was produced. An active material-unfilled portion having a width of 1.5 mm is provided at the upper end of the positive electrode plate of this electrode group. On the other hand, an active material-unfilled portion is also provided at the lower end of the negative electrode plate protruding from the lower surface of the electrode group.
【００３２】正極板端部に図１に示した集電端子を押圧
して、集電端子のリブ状突起を極板端部に予めくい込ま
せた後、集電端子のスリットを挟む平面部にシリーズ溶
接（溶接点数：６点）を行い図６の状態となるようにし
た。一方、負極端部には直径が２８ｍｍφ、厚さが０．
３ｍｍのニッケル製負極集電端子をシリーズ溶接（溶接
点数：１６点）した後、電槽に挿入し、電槽底部と負極
集電端子とのスポット溶接を行った。The current collecting terminal shown in FIG. 1 is pressed against the end of the positive electrode plate, and the rib-shaped projections of the current collecting terminal are previously inserted into the end of the electrode plate. Series welding (the number of welding points: 6 points) was performed so that the state shown in FIG. 6 was obtained. On the other hand, the end of the negative electrode has a diameter of 28 mmφ and a thickness of 0.2 mm.
A series of 3 mm nickel-made negative electrode current collecting terminals were welded (the number of welding points: 16), and then inserted into a battery case, and spot welding was performed between the battery case bottom and the negative electrode current collecting terminal.
【００３３】次に、この正極集電端子１と図５の金属リ
ード片５及び電池蓋とを溶接し、図８に示すような接続
構造となるようにした。Next, the positive electrode current collecting terminal 1 was welded to the metal lead piece 5 and the battery cover of FIG. 5 to form a connection structure as shown in FIG.
【００３４】公知の方法を用いて水酸化カリウムを主体
とする電解液を所定量注入した後、封口することにより
Ｄサイズの本発明電池Ａを作製した。After a predetermined amount of an electrolyte mainly composed of potassium hydroxide was injected by a known method, the battery A of the present invention having a D size was prepared by sealing the battery.
【００３５】次に比較例として、図１に示した集電端子
１に替えて図４に示した集電端子３を用いて正極端部と
シリーズ溶接（溶接点数：１６点）を行った。それ以外
は本発明電池Ａと同様に作製した。該電池を比較例電池
Ｂとした。Next, as a comparative example, series welding (the number of welding points: 16) was performed with the positive electrode end using the current collecting terminal 3 shown in FIG. 4 instead of the current collecting terminal 1 shown in FIG. Otherwise, the battery was fabricated in the same manner as the battery A of the invention. This battery was designated as Comparative Example Battery B.
【００３６】これらの電池を活性化した後、２５℃雰囲
気下で４Ａの定電流で２時間充電した。次いで０℃雰囲
気下で５時間の放置した後、同温度に於いて４０Ａの定
電流でセル電圧が０．９Ｖになるまでの放電を行った。
図１１に放電容量とセル電圧の関係を示す。After activating these batteries, they were charged at a constant current of 4 A in an atmosphere of 25 ° C. for 2 hours. Next, after leaving it for 5 hours in an atmosphere of 0 ° C., discharging was performed at the same temperature at a constant current of 40 A until the cell voltage reached 0.9 V.
FIG. 11 shows the relationship between the discharge capacity and the cell voltage.
【００３７】また、２５℃、４５℃、５５℃の各温度に
おいて４Ａの定電流で１時間３６分の充電（定格容量の
８０％）を行った後、各温度雰囲気下で４Ａの定電流で
セル電圧が０．９Ｖになるまでの放電を行った。図１２
に温度と放電容量の関係を示す。After charging at a constant current of 4 A for 1 hour and 36 minutes (80% of the rated capacity) at each temperature of 25 ° C., 45 ° C., and 55 ° C., at a constant current of 4 A under each temperature atmosphere. Discharge was performed until the cell voltage reached 0.9 V. FIG.
Shows the relationship between temperature and discharge capacity.
【００３８】図１１の結果から、本発明電池Ａは比較例
電池Ｂに比べて放電電圧が高いことが明らかである。こ
れは前記に示した如く、本発明電池Ａが高い集電効果を
有する為と考えられる。From the results shown in FIG. 11, it is clear that the battery A of the present invention has a higher discharge voltage than the battery B of the comparative example. This is considered to be because the battery A of the present invention has a high current collecting effect as described above.
【００３９】図１２の結果では、雰囲気温度が上昇する
につれて本発明電池Ａと比較例電池Ｂとの放電容量に差
が見られる。これは、本発明電池Ａの集電効果が高く、
電池の内部抵抗が低い為充電電圧が低く抑えられ、水の
電気分解等の副反応が抑えられることにより充電効率が
向上したためと考えられる。In the results of FIG. 12, a difference is seen in the discharge capacity between the battery A of the present invention and the battery B of the comparative example as the ambient temperature increases. This is because the current collecting effect of the battery A of the present invention is high,
It is considered that the charging voltage was kept low because the internal resistance of the battery was low, and the charging efficiency was improved by suppressing side reactions such as electrolysis of water.
【００４０】以上のように、本発明電池Ａは比較例電池
Ｂに比べて充電及び放電の双方の反応効率が向上してい
ることが明らかである。As described above, it is clear that the battery A of the present invention has improved reaction efficiency in both charging and discharging as compared with the battery B of the comparative example.
【００４１】（実施例２）ニッケルの一部を亜鉛及びコ
バルトで置換した高密度水酸化ニッケルの表面にコバル
ト酸化物を被覆した活物質を３次元の発泡状ニッケル基
板に充填し、５５０ｍＡｈ／ｃｍ２の理論容量密度の極
板を作製した。正極板の端部には幅１．５ｍｍｘ７５ｍ
ｍの活物質未充填部分を設けており、極板の大きさは４
２ｍｍｘ７５ｍｍで厚みが０．４ｍｍのものである。一
方、水素吸蔵合金を主体とする活物質をニッケルメッキ
パンチング鋼板に塗着し、１２００ｍＡｈ／ｃｍ２の理
論容量密度の負極板を作製した。負極板の端部には幅
１．５ｍｍｘ７５ｍｍの活物質未充填部分を設けてお
り、極板の大きさは４２ｍｍｘ７５ｍｍで厚みが０．３
ｍｍである。EXAMPLE 2 A three-dimensional foamed nickel substrate was filled with an active material in which a surface of a high-density nickel hydroxide in which a part of nickel was replaced with zinc and cobalt was coated with a cobalt oxide, and was filled with 550 mAh / cm 2. The electrode plate having the theoretical capacity density of was manufactured. 1.5mm x 75m width at the end of the positive electrode plate
m active material unfilled part is provided, and the size of the electrode plate is 4
It is 2 mm x 75 mm and 0.4 mm thick. On the other hand, an active material mainly composed of a hydrogen storage alloy was applied to a nickel-plated punched steel plate to produce a negative electrode plate having a theoretical capacity density of 1200 mAh / cm2. An end portion of the negative electrode plate is provided with an unfilled portion of an active material having a width of 1.5 mm x 75 mm. The size of the electrode plate is 42 mm x 75 mm and the thickness is 0.3.
mm.
【００４２】これらの正極板と負極板とを不織布製のセ
パレータを介して積層した。積層に際しては幅方向に
１．５ｍｍずつずらした状態で積層し、正極板が１２枚
と負極板が１３枚の極群を作製した。正極板と負極板の
端部に設けた活物質未充填部分は相対向する側辺にくる
ように積層されている。この極群を厚み方向に圧力をか
けて固定した後、正極板の端部に図２に示した集電端子
２を押圧してリブ状突起２ｂを極板端部に食い込ませた
後、集電端子のスリットを挟む平面部にシリーズ溶接
（溶接点数：６点）によって取り付けた。The positive electrode plate and the negative electrode plate were laminated via a nonwoven fabric separator. At the time of lamination, lamination was carried out in a state shifted by 1.5 mm in the width direction to prepare a pole group having 12 positive electrode plates and 13 negative electrode plates. The active material unfilled portions provided at the ends of the positive electrode plate and the negative electrode plate are stacked so as to be on opposite sides. After fixing the electrode group by applying pressure in the thickness direction, the collector terminal 2 shown in FIG. 2 is pressed against the end of the positive electrode plate to make the rib-like projections 2b bite into the end of the electrode plate. The terminal was attached to the flat portion sandwiching the slit of the terminal by series welding (the number of welding points: 6).
【００４３】一方、負極板端部には幅が１０ｍｍ、長さ
が１００ｍｍ、厚さが０．４ｍｍのニッケル製集電端子
をシリーズ溶接（溶接点数：１６点）した。溶接機の棒
状電極の直径は５ｍｍφであり、先端が平面な電極を使
用した。以上により図１０に示した集電端子付き極群を
作製した。On the other hand, a nickel current collecting terminal having a width of 10 mm, a length of 100 mm, and a thickness of 0.4 mm was series-welded to the end of the negative electrode plate (the number of welding points: 16). The diameter of the rod-shaped electrode of the welding machine was 5 mmφ, and an electrode having a flat tip was used. Thus, the electrode group with a current collecting terminal shown in FIG. 10 was produced.
【００４４】この電極群を角形の樹脂電槽に挿入し、水
酸化カリウムを主成分とする電解液を所定量注入した
後、蓋を溶着して本発明電池Ｃ（公称容量８Ａｈ）を作
製した。電池外部と電池内部とは正極及び負極の集電端
子により導通されており、密閉性を保つため隙間を樹脂
で固定した。This electrode group was inserted into a rectangular resin battery case, a predetermined amount of an electrolyte mainly composed of potassium hydroxide was injected, and the lid was welded to produce a battery C of the present invention (nominal capacity: 8 Ah). . The outside of the battery and the inside of the battery were electrically connected to each other by current collecting terminals of a positive electrode and a negative electrode, and a gap was fixed with a resin in order to maintain airtightness.
【００４５】（比較例２）前記実施例２において、正極
集電端子として図２に示したリブ状突起付き集電端子２
に替えて図５に示した集電端子４を用いた以外は実施例
２と同一の方法で電池を作製した。溶接点数も６点で実
施例２と同一にした。本電池を比較例電池Ｄとした。(Comparative Example 2) In the above-mentioned Example 2, the current collecting terminal 2 with the rib-like projections shown in FIG.
A battery was manufactured in the same manner as in Example 2 except that the current collecting terminal 4 shown in FIG. The number of welding points was also the same as in Example 2 with 6 points. This battery was designated as Comparative Example Battery D.
【００４６】これらの電池を活性化した後、２５℃雰囲
気下で４Ａの定電流で２時間充電した。その後０℃雰囲
気下で５時間放置した後、同温度に於いて４０Ａの定電
流でセル電圧が０．９Ｖになるまでの放電を行った。図
１３に放電容量とセル電圧の関係を示す。After activating these batteries, they were charged at a constant current of 4 A for 2 hours in an atmosphere of 25 ° C. Then, after leaving it for 5 hours in an atmosphere of 0 ° C., discharge was performed at the same temperature at a constant current of 40 A until the cell voltage reached 0.9 V. FIG. 13 shows the relationship between the discharge capacity and the cell voltage.
【００４７】また、２５℃、４５℃、５５℃の各温度に
おいて４Ａの定電流で１時間３６分の充電（定格容量の
８０％）を行った後、各温度雰囲気下で４Ａの定電流で
セル電圧が０．９Ｖになるまでの放電を行った。図１４
に温度と放電容量の関係を示す。After charging at a constant current of 4 A for 1 hour and 36 minutes (80% of the rated capacity) at each temperature of 25 ° C., 45 ° C., and 55 ° C., at a constant current of 4 A under each temperature atmosphere. Discharge was performed until the cell voltage reached 0.9 V. FIG.
Shows the relationship between temperature and discharge capacity.
【００４８】図１３の結果に示した如く、本発明電池Ｃ
は比較例電池Ｄに比べて高い放電電圧を示す。これは本
発明電池Ｃにおいては、前記本発明電池Ａと同様、比較
例電池Ｄと比べて集電効果が高められた結果であると考
えられる。As shown in the results of FIG.
Indicates a higher discharge voltage than the battery D of the comparative example. This is considered to be the result of the battery C of the present invention having a higher current collection effect than the battery D of the comparative example, similarly to the battery A of the present invention.
【００４９】図１５の結果では、雰囲気温度が上昇する
につれて本発明電池Ｃは実施例１の比較例電池Ｂに比べ
て放電容量に差が見られる。これは、前記本発明電池Ａ
と同様集電効果が高められたことにより充電効率が向上
したためと考えられる。以上のように、本発明電池Ｃは
実施例１の比較例電池Ｂに比べて充電及び放電の双方の
反応効率が向上している。According to the results shown in FIG. 15, the battery C of the present invention has a difference in discharge capacity as compared with the battery B of the comparative example of Example 1 as the ambient temperature increases. This is the battery A of the present invention.
It is considered that the charging efficiency was improved due to the enhancement of the current collection effect as in the case described above. As described above, the battery C of the present invention has improved reaction efficiency in both charging and discharging as compared with the comparative example battery B of Example 1.
【００５０】本実施例では集電端子と金属リード片とを
溶接により接続したが、一体成形することによりさらに
工程の簡略化及び抵抗の低減を図ることが可能である。
本実施例では集電端子の厚み及び金属リード片の厚みが
０．５ｍｍ以下のものを用いたが、電池に要求される最
大電流値により適切な厚みを選択することができる。集
電端子の平面部の溶接を考慮するとその範囲は０．２〜
１．２ｍｍであることが望ましい。In the present embodiment, the current collecting terminal and the metal lead piece are connected by welding. However, by integrally molding, it is possible to further simplify the process and reduce the resistance.
In this embodiment, the thickness of the current collecting terminal and the thickness of the metal lead piece are 0.5 mm or less. However, an appropriate thickness can be selected according to the maximum current value required for the battery. Considering the welding of the flat part of the collector terminal, the range is 0.2 to
Desirably, it is 1.2 mm.
【００５１】本実施例ではコストの低減を図るために鉄
にニッケルメッキされている材料を用いたが、金属ニッ
ケル単体などの耐アルカリ性材料を使用することにより
さらに抵抗の低減を図ることが可能である。In this embodiment, a material plated with nickel on iron is used in order to reduce the cost. However, the resistance can be further reduced by using an alkali-resistant material such as metallic nickel alone. is there.
【００５２】[0052]
【発明の効果】本発明の請求項１によれば、少ない溶接
点数で正極集電端子と正極板端部との電気的接続点数を
多く、かつ偏り無く設置することができるので、集電効
果が高く電気的特性に優れたアルカリ蓄電池を生産性良
く提供することができる。本発明の請求項２によれば、
集電端子のリブ状突起を正極板端部に無理無く食い込ま
せることができるので、正極集電端子と正極板の間で接
触による良好な電気的接続を得ることができる。そのた
めに集電効果を高めることができる。以上のように本発
明は高容量の非焼結式正極を用いたアルカリ蓄電池にお
いて、高率放電特性に優れた電池を実現するもので、工
業的価値は大きい。According to the first aspect of the present invention, the number of electrical connection points between the positive electrode current collecting terminal and the end of the positive electrode plate can be increased with a small number of welding points and can be installed without bias. It is possible to provide an alkaline storage battery with high productivity and excellent electrical characteristics with high productivity. According to claim 2 of the present invention,
Since the rib-shaped projections of the current collecting terminal can be easily bite into the end of the positive electrode plate, good electrical connection can be obtained by contact between the positive electrode current collecting terminal and the positive electrode plate. Therefore, the current collecting effect can be enhanced. As described above, the present invention realizes a battery excellent in high-rate discharge characteristics in an alkaline storage battery using a high-capacity non-sintered positive electrode, and has great industrial value.
【図１】本発明に係る円筒形電池用集電端子の１例を示
す斜視図である。FIG. 1 is a perspective view showing an example of a current collecting terminal for a cylindrical battery according to the present invention.
【図２】（Ａ）は本発明に係る角形電池用集電端子の１
例を示す斜視図、（Ｂ）は（Ａ） のＡ−Ａ′に於け
る断面図である。FIG. 2A shows one of the current collecting terminals for a prismatic battery according to the present invention.
FIG. 2B is a perspective view showing an example, and FIG. 2B is a sectional view taken along line AA ′ of FIG.
【図３】本発明に係る円筒形電池用集電端子の１例を示
す斜視図である。FIG. 3 is a perspective view showing an example of a current collecting terminal for a cylindrical battery according to the present invention.
【図４】従来の円筒形電池用集電端子を示す平面図であ
る。FIG. 4 is a plan view showing a conventional collecting terminal for a cylindrical battery.
【図５】従来の角形電池用集電端子を示す平面図であ
る。FIG. 5 is a plan view showing a conventional current collecting terminal for a rectangular battery.
【図６】本発明に係る円筒形電池における集電端子と正
極板端部との溶接状態を示す説明図である。FIG. 6 is an explanatory view showing a welding state between a current collecting terminal and an end of a positive electrode plate in the cylindrical battery according to the present invention.
【図７】本発明に係る円筒形電池における集電端子付き
極群を真上から見た状態を示す説明図である。FIG. 7 is an explanatory view showing a state in which a pole group with a current collecting terminal is viewed from directly above in a cylindrical battery according to the present invention.
【図８】本発明に係る円筒形電池における極群／集電端
子／金属リード片／電池蓋の接続構造を示す説明図であ
る。FIG. 8 is an explanatory diagram showing a connection structure of a pole group / current collecting terminal / metal lead piece / battery cover in the cylindrical battery according to the present invention.
【図９】本発明に係る金属リード片を示す図である。FIG. 9 is a view showing a metal lead piece according to the present invention.
【図１０】本発明に係る角形電池における集電端子と電
極との接続構造を示す説明図である。FIG. 10 is an explanatory view showing a connection structure between a current collecting terminal and an electrode in the prismatic battery according to the present invention.
【図１１】本発明電池Ａと比較例電池Ｂの放電特性を示
すグラフである。FIG. 11 is a graph showing the discharge characteristics of the battery A of the present invention and the battery B of the comparative example.
【図１２】本発明電池Ａと比較例電池Ｂの温度特性を示
すグラフである。FIG. 12 is a graph showing temperature characteristics of a battery A of the present invention and a battery B of a comparative example.
【図１３】本発明電池Ｃと比較例電池Ｄの放電特性を示
すグラフである。FIG. 13 is a graph showing discharge characteristics of Battery C of the present invention and Battery D of Comparative Example.
【図１４】本発明電池Ｃと比較例電池Ｄの温度特性を示
すグラフである。FIG. 14 is a graph showing temperature characteristics of a battery C of the present invention and a battery D of a comparative example.
１、２、３ 集電端子 １ｂ、２ｂ、３ｂ リブ状突起 １ｃ、２ｃ、３ｃ スリット ６ａ、１０ａ 正極板の端部 1, 2, 3 Current collecting terminals 1b, 2b, 3b Rib-shaped protrusions 1c, 2c, 3c Slits 6a, 10a Ends of positive electrode plate
───────────────────────────────────────────────────── フロントページの続き (72)発明者 礒谷 達雄 大阪府高槻市古曽部町二丁目３番21号 株 式会社ユアサコーポレーション内 Ｆターム(参考） 5H022 AA04 BB01 BB11 CC12 CC13 CC16 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Tatsuo Isotani 2-3-1, Furusobe-cho, Takatsuki-shi, Osaka F-term in Yuasa Corporation 5H022 AA04 BB01 BB11 CC12 CC13 CC16
Claims (2)
端部および負極板端部に集電端子が溶接されて成るアル
カリ蓄電池において、前記極板端部の中少なくとも一方
の極板端部がフェルト状またはスポンジ状金属多孔体で
あり、該極板端部に溶接された集電端子がスリットおよ
び極群に面する側にリブ状突起を有する平板であって、
前記スリットを挟む平面部が極板端部に溶接され、前記
リブ状突起が極板端部と交差し食い込んで接触している
ことを特徴とするアルカリ蓄電池。1. An alkaline storage battery in which a current collecting terminal is welded to an end of a positive electrode plate and an end of a negative electrode plate protruding from opposing outer surfaces of an electrode group, wherein at least one of the ends of the electrode plates is provided. The part is a felt-like or sponge-like porous metal body, and the current collecting terminal welded to the end of the electrode plate is a flat plate having a slit and a rib-like projection on a side facing the electrode group,
An alkaline storage battery, wherein a flat portion sandwiching the slit is welded to an end of the electrode plate, and the rib-shaped protrusion intersects and bites into contact with the end of the electrode plate.
が略垂直に交差していることを特徴とする請求項１記載
のアルカリ蓄電池。2. The alkaline storage battery according to claim 1, wherein the rib-like projection of the current collecting terminal and the end of the electrode plate intersect substantially vertically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000199498A JP3952493B2 (en) | 2000-06-30 | 2000-06-30 | Alkaline storage battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000199498A JP3952493B2 (en) | 2000-06-30 | 2000-06-30 | Alkaline storage battery |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2002015722A true JP2002015722A (en) | 2002-01-18 |
| JP2002015722A5 JP2002015722A5 (en) | 2005-02-10 |
| JP3952493B2 JP3952493B2 (en) | 2007-08-01 |
Family
ID=18697504
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000199498A Expired - Fee Related JP3952493B2 (en) | 2000-06-30 | 2000-06-30 | Alkaline storage battery |
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| Country | Link |
|---|---|
| JP (1) | JP3952493B2 (en) |
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| US7736803B2 (en) | 2007-08-15 | 2010-06-15 | Sony Corporation | Non-aqueous electrolyte secondary battery |
| JP4569608B2 (en) * | 2007-08-15 | 2010-10-27 | ソニー株式会社 | Nonaqueous electrolyte secondary battery |
| JP2009048806A (en) * | 2007-08-15 | 2009-03-05 | Sony Corp | Nonaqueous electrolyte secondary battery |
| JP2009117092A (en) * | 2007-11-05 | 2009-05-28 | Panasonic Corp | Secondary battery and its manufacturing method |
| WO2009060564A1 (en) * | 2007-11-05 | 2009-05-14 | Panasonic Corporation | Secondary cell and its manufacturing method |
| US8354187B2 (en) | 2007-11-05 | 2013-01-15 | Panasonic Corporation | Secondary battery and method for producing the same |
| JP2015170553A (en) * | 2014-03-10 | 2015-09-28 | トヨタ自動車株式会社 | Power storage device and manufacturing method therefor |
| WO2023013835A1 (en) * | 2021-08-02 | 2023-02-09 | 충남대학교산학협력단 | Electrode having current collector that has three-dimensional structure, and battery using same |
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