JP2949567B2 - Prismatic sealed battery - Google Patents
Prismatic sealed batteryInfo
- Publication number
- JP2949567B2 JP2949567B2 JP7192069A JP19206995A JP2949567B2 JP 2949567 B2 JP2949567 B2 JP 2949567B2 JP 7192069 A JP7192069 A JP 7192069A JP 19206995 A JP19206995 A JP 19206995A JP 2949567 B2 JP2949567 B2 JP 2949567B2
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- electrode plate
- electrode tab
- tab
- plate
- 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
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、角形密閉電池に関
し、更に詳しくは、正極タブと負極板との接触による短
絡の発生が少ない角形密閉電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed rectangular battery, and more particularly, to a sealed rectangular battery in which a short circuit due to contact between a positive electrode tab and a negative electrode plate is reduced.
【０００２】[0002]
【関連する技術】ニッケル−水素二次電池やニッケル−
カドミウム電池のようなアルカリ二次電池は、全体とし
て密閉構造になっていて、その形状には円筒形と角形と
がある。ここで、例えば、角形密閉タイプのニッケル−
水素二次電池につき、その構造を図１に基づいて説明す
る。[Related technologies] Nickel-hydrogen secondary batteries and nickel-
Alkaline secondary batteries such as cadmium batteries have a hermetically sealed structure as a whole, and there are cylindrical and square shapes. Here, for example, a square sealed nickel-
The structure of the hydrogen secondary battery will be described with reference to FIG.
【０００３】角形のニッケル−水素二次電池は、内部に
極板群３を収容する外装缶１と、極板群３を収容した後
に外装缶１の開口部１ａに嵌合装着され、その開口部１
ａを密閉する蓋板２とを備えている。外装缶１は、ニッ
ケルメッキを施した鋼製の直方体状の有底缶であり、平
面視したときの形状が矩形状である開口部１ａを備えて
いて、負極の外部端子も兼ねている。尚、本発明におい
ては、外装缶の開口部１ａ側を上、外装缶の底側を下と
する。よって、後述する極板群３についても、外装缶に
収容された状態で開口部１ａ側を上、底側を下とする。[0003] A prismatic nickel-hydrogen secondary battery has an outer can 1 accommodating an electrode plate group 3 therein, and is fitted into an opening 1a of the outer can 1 after accommodating the electrode plate group 3 therein. Part 1
and a lid plate 2 that seals a. The outer can 1 is a nickel-plated steel rectangular parallelepiped bottomed can having an opening 1a having a rectangular shape in plan view, and also serves as an external terminal of a negative electrode. In the present invention, the side of the opening 1a of the outer can is defined as the upper side, and the bottom side of the outer can is defined as the lower side. Therefore, also about the electrode group 3 mentioned later, the opening part 1a side is made up and the bottom side is made down in the state accommodated in the outer can.
【０００４】蓋板２は、中央に正極端子２１を備え、平
面視形状が外装缶の開口部１ａに適合するような矩形状
をなしており、その下面の所定位置には正極端子に接続
されている正極リード板が配設されている。極板群３
は、図２に示すように、正極板（ニッケル極）３１と負
極板（水素吸蔵合金電極）３２とを、電気絶縁性のセパ
レータ３３を互いの間に介在させた状態で複数枚重ね合
わせた構造になっており、外装缶の開口部１ａから挿入
されて外装缶１内に収容される。この極板群３は、全体
として、外装缶１の内側形状に適合するように略直方体
状に成形されている。尚、本発明においては、外装缶１
の短辺に相当する部分（図２中の３ａ）を短辺、外装缶
の長辺に相当する部分（図２中の３ｂ）を長辺という。The cover plate 2 is provided with a positive electrode terminal 21 at the center, and has a rectangular shape whose plan view conforms to the opening 1a of the outer can, and is connected to the positive electrode terminal at a predetermined position on the lower surface. Positive electrode lead plate is disposed. Electrode group 3
As shown in FIG. 2, a plurality of positive electrode plates (nickel electrodes) 31 and negative electrode plates (hydrogen storage alloy electrodes) 32 were stacked with an electrically insulating separator 33 interposed therebetween. It has a structure, and is inserted through the opening 1a of the outer can and is housed in the outer can 1. The electrode plate group 3 is generally formed in a substantially rectangular parallelepiped shape so as to conform to the inner shape of the outer can 1. In the present invention, the outer can 1
The portion corresponding to the short side (3a in FIG. 2) is referred to as the short side, and the portion corresponding to the long side of the outer can (3b in FIG. 2) is referred to as the long side.
【０００５】正極板（ニッケル極）３１としては、例え
ば、スポンジ状のニッケル板のような多孔質の導電板に
正極活物質として動作する水酸化ニッケルを主体とする
活物質合剤を充填塗布したものが通常用いられている。
正極板３１は、その一方の側面に、正極タブを備えてい
る。この正極タブ３４は、例えば、ニッケル製のシート
状の小片であり、極板群として組み立てたときに、当該
極板群の上部より上方へ向かって所定長さだけ突出する
ように配設されている（図２参照）。As a positive electrode plate (nickel electrode) 31, for example, a porous conductive plate such as a sponge-like nickel plate is filled and coated with an active material mixture mainly composed of nickel hydroxide which operates as a positive electrode active material. Things are usually used.
The positive electrode plate 31 has a positive electrode tab on one side surface. The positive electrode tab 34 is, for example, a sheet-like small piece made of nickel, and is disposed so as to protrude upward from an upper portion of the electrode plate group by a predetermined length when assembled as an electrode plate group. (See FIG. 2).
【０００６】前記正極タブの取付け手順の一例として
は、まず、図３に示すように、正極板３１の両側面３１
ａ，３１ｂにおける上部の所定位置をプレス機により厚
さ方向に圧縮し、凹部３１ｃ，３１ｄを形成し、一方の
側面（図では側面３１ｂ）の凹部３１ｄに正極タブ３４
の一端をはめ込むようにして、当該正極タブ３４の一端
を凹部３１ｄにスポット溶接する。このとき、凹部の深
さ及び正極タブの厚さの寸法は、正極板３１の側面３１
ｂと正極タブ３４の溶接面の反対側の面とが略面一にな
るように、予め所定寸法に設定しておく。As an example of the procedure for mounting the positive electrode tab, first, as shown in FIG.
a, 31b are compressed in the thickness direction by a press machine to form concave portions 31c, 31d, and the positive electrode tab 34 is formed in the concave portion 31d on one side surface (side surface 31b in the figure).
And one end of the positive electrode tab 34 is spot-welded to the recess 31d. At this time, the dimensions of the depth of the concave portion and the thickness of the positive electrode tab are determined by the side surface 31 of the positive electrode plate 31.
A predetermined dimension is set in advance so that b and the surface opposite to the welding surface of the positive electrode tab 34 are substantially flush.
【０００７】負極板（水素吸蔵合金電極）３２として
は、例えば、パンチングニッケル板やニッケルネットの
ような多孔質の導電板に、水素吸蔵合金粉末とニッケル
粉末のような導電材粉末とポリビニリデンフルオライド
のような結着剤粉末とを所定割合で混合した混合物を充
填塗布したものが通常用いられている。セパレータ３３
としては、例えば、電気絶縁性を有する多孔質の合成樹
脂からなるシートが通常用いられている。As the negative electrode plate (hydrogen storage alloy electrode) 32, for example, a porous conductive plate such as a punched nickel plate or a nickel net, a conductive material powder such as a hydrogen storage alloy powder and a nickel powder, and a polyvinylidene fluoride A material obtained by filling and coating a mixture obtained by mixing a binder powder such as a ride at a predetermined ratio is usually used. Separator 33
For example, a sheet made of a porous synthetic resin having electrical insulation properties is generally used.
【０００８】前記極板群３の組立手順の一例としては、
まず、セパレータ３３を二つ折りにして封筒状に成形
し、その中に、正極タブを上にして正極板３１を挿入
し、セパレータ３３と正極板３１との結合体を形成した
のち、当該結合体と負極板３２とを交互に重ね合わせて
いく。このとき、各正極板３１は、例えば、１枚目の正
極板の正極タブが溶接されている側面３１ｂと２枚目の
正極板の正極タブが溶接されていない側面３１ａとが向
かい合うように配置する。尚、最外部には、負極板が位
置するようにする。そして、全体として、図２に示すよ
うな、外装缶の内部に適合して挿入できるような略直方
体に成形する。An example of the procedure for assembling the electrode plate group 3 is as follows.
First, the separator 33 is folded in two and formed into an envelope shape. The positive electrode plate 31 is inserted into the envelope with the positive electrode tab facing upward, and a combined body of the separator 33 and the positive electrode plate 31 is formed. And the negative electrode plate 32 are alternately superposed. At this time, each positive electrode plate 31 is arranged such that, for example, the side surface 31b of the first positive electrode plate to which the positive electrode tab is welded and the side surface 31a of the second positive electrode plate to which the positive electrode tab is not welded face each other. I do. The negative electrode plate is located at the outermost position. Then, as a whole, it is formed into a substantially rectangular parallelepiped shape as shown in FIG.
【０００９】したがって、得られた極板群においては、
上部より正極タブが上方に突出する。ここで、各負極板
は、底部側あるいは上部側（図２においては上部側）の
所定位置において、導電性シート３５の一端が接合され
ている。そして、各導電性シート３５はその他端が一個
所に集束されて接合され、負極全体が電気的に接続され
た状態になっている。Therefore, in the obtained electrode plate group,
The positive electrode tab protrudes upward from the upper part. Here, one end of the conductive sheet 35 is joined at a predetermined position on the bottom side or the upper side (the upper side in FIG. 2) of each negative electrode plate. The other end of each conductive sheet 35 is converged and joined at one location, and the whole negative electrode is electrically connected.
【００１０】次に、電池の製造に際し、前記極板群３の
正極タブ３４の他端３４ａは、図２のＩＶ−ＩＶ線に沿
う断面図である図４に示すように、正極端子との接続を
容易にするため、一個所（集束個所Ｊ）に集められて接
合され、そのことによって、各正極板３１は、電気的に
一つにまとめられる。このように、正極タブ３４の他端
３４ａが集束された極板群３は、引き続き、外装缶１の
開口部１ａより外装缶１内へ挿入される。そして、外装
缶１内に、アルカリ電解液が注入され、その後、一個所
に集束されている各正極タブ３４の他端３４ａと、蓋板
の正極端子２１とが蓋板の下面に配設されている正極リ
ード板を介して接続される。Next, in manufacturing the battery, the other end 34a of the positive electrode tab 34 of the electrode plate group 3 is connected to the positive electrode terminal as shown in FIG. 4 which is a cross-sectional view taken along the line IV-IV in FIG. In order to facilitate the connection, they are gathered and joined at one location (convergence location J), whereby each positive electrode plate 31 is electrically united. The electrode plate group 3 in which the other end 34a of the positive electrode tab 34 is thus bundled is continuously inserted into the outer can 1 through the opening 1a of the outer can 1. Then, an alkaline electrolyte is injected into the outer can 1, and thereafter, the other end 34a of each positive electrode tab 34, which is focused at one location, and the positive electrode terminal 21 of the lid plate are disposed on the lower surface of the lid plate. Connected via a positive electrode lead plate.
【００１１】そして、最後に、外装缶１の開口部１ａ
に、蓋板２が嵌合装着され、外装缶１の開口部１ａと蓋
板３１とが合致した部分（以下、嵌合部という）に対
し、通常、微細加工に適したパルス式レーザー溶接が施
され、外装缶１と蓋板２との封口溶接がなされ、密閉構
造の角形電池が形成される。Then, finally, the opening 1a of the outer can 1
In addition, a pulse type laser welding suitable for fine processing is usually performed on a portion (hereinafter, referred to as a fitting portion) where the cover plate 2 is fitted and mounted and the opening 1a of the outer can 1 and the cover plate 31 match (hereinafter, referred to as a fitting portion). Then, the outer can 1 and the lid plate 2 are sealed and welded to form a sealed rectangular battery.
【００１２】[0012]
【発明が解決しようとする課題】上記した極板群におい
て、各正極タブ３４の他端３４ａの集束個所Ｊは、極板
群の長辺部近傍に位置し、通常は、図４で示したよう
に、各正極板３１における正極タブ３４の一端３４ｂが
取付けられている側の側面３１ｂとは反対側の方に位置
する個所である。そして、各正極タブ３４の他端３４ａ
を集束するときには、各正極タブの他端３４ａを矢印Ｐ
方向に引張って集束個所Ｊでそれらの他端３４ａを集束
し、全体を溶接する。In the above-mentioned electrode group, the convergence point J at the other end 34a of each positive electrode tab 34 is located near the long side of the electrode group, and is usually shown in FIG. As described above, the portion is located on the side opposite to the side surface 31b on the side where the one end 34b of the positive electrode tab 34 in each positive electrode plate 31 is attached. Then, the other end 34a of each positive electrode tab 34
When focusing, the other end 34a of each positive electrode tab is
The other end 34a is focused at the focusing point J by pulling in the direction, and the whole is welded.
【００１３】上述したような状態で、各正極タブ３４の
他端３４ａを集束した場合、図５に示すように、正極タ
ブ３４には矢印Ｐ方向の力が加えられるので、正極タブ
３４は撓むことがある。そして、その撓みが大きくなる
と、正極タブ３４の一端３４ｂは、正極板との溶接部か
ら剥離し、当該正極タブの一端３４ｂの下端部が隣接す
るセパレータ３３にくい込むことがある。そして、最悪
の場合、この下端部は前記セパレータ３３を突き破り、
更に、その先の負極板３２と接触し、短絡事故を起こす
ことがある。When the other end 34a of each positive electrode tab 34 is converged in the above-described state, as shown in FIG. 5, a force in the direction of arrow P is applied to the positive electrode tab 34, so that the positive electrode tab 34 is bent. Can be When the bending becomes large, the one end 34b of the positive electrode tab 34 is peeled off from the welded portion with the positive electrode plate, and the lower end of the one end 34b of the positive electrode tab may be hardly inserted into the adjacent separator 33. In the worst case, this lower end pierces the separator 33,
In addition, it may come into contact with the negative electrode plate 32 ahead of it, causing a short circuit accident.
【００１４】本発明は、角形密閉電池における上記した
問題を解決し、正極タブの他端を集束する際に、正極板
に取付けた正極タブの下端部がセパレータを突き破り、
負極板と接触して短絡を起こすことを防止することがで
きる構造の角形密閉電池を提供することを目的とする。[0014] The present invention solves the above-mentioned problem in the rectangular sealed battery. When the other end of the positive electrode tab is focused, the lower end of the positive electrode tab attached to the positive electrode plate breaks through the separator,
It is an object of the present invention to provide a rectangular sealed battery having a structure capable of preventing a short circuit from being caused by contact with a negative electrode plate.
【００１５】[0015]
【課題を解決するための手段】上記目的を達成するため
に、本発明では、矩形開口部を有する有底の外装缶の中
に、アルカリ電解液とともに、負極板と一方の側面に正
極タブの一端が取付けられた正極板とがセパレータを介
して多数配置されて一体化された極板群が収容され、前
記矩形開口部が正極端子を有する蓋板で密閉され、か
つ、前記各正極タブの他端が一個所に集束されて前記正
極端子と接続されている角形密閉電池において、前記正
極タブの一端は、前記正極板の側面のうち前記各正極タ
ブの他端の集束個所に近い方の側面に取付けられている
ことを特徴とする角形密閉電池が提供される。In order to achieve the above object, according to the present invention, a negative electrode plate and a positive electrode tab are provided on one side surface together with an alkaline electrolyte in a bottomed outer can having a rectangular opening. A large number of positive electrode plates each having one end attached thereto are disposed via a separator, and an integrated electrode plate group is accommodated therein.The rectangular opening is sealed with a lid plate having a positive electrode terminal, and In a rectangular sealed battery having the other end converged at one location and connected to the positive electrode terminal, one end of the positive electrode tab is closer to the other end of each of the positive electrode tabs on the side surface of the positive electrode plate. A rectangular sealed battery characterized by being mounted on a side surface is provided.
【００１６】本発明による角形密閉電池は、極板群の正
極板に取り付けられる正極タブを、各正極板において、
各正極タブの他端の集束個所に近い方の面に溶接してい
るので、前記正極タブの他端を集束する際に、正極タブ
に集束個所方向へ向かう力が加えられ、当該正極タブが
撓んだとしても、その下端部は、当該正極タブが溶接さ
れている正極板に押しつけられる方向にのみ力が加わる
ので、正極タブの下端部がセパレータを突き破り、隣接
する負極板に接触するということは抑えられる。In the prismatic sealed battery according to the present invention, a positive electrode tab attached to the positive electrode plate of the electrode group is provided on each positive electrode plate by:
Since the other end of each positive electrode tab is welded to the surface closer to the focusing point, when the other end of the positive electrode tab is focused, a force is applied to the positive electrode tab toward the focusing point, and the positive electrode tab is Even if it bends, the lower end portion applies a force only in the direction pressed against the positive electrode plate to which the positive electrode tab is welded, so that the lower end portion of the positive electrode tab breaks through the separator and contacts the adjacent negative electrode plate. Things can be suppressed.
【００１７】[0017]
【発明の実施の形態】図６に本発明の角形密閉電池にお
ける極板群の一例を示す。この極板群３Ａでは、各正極
板３１において、正極タブの一端３４ｂが当該正極タブ
の他端３４ａの集束個所Ｊに近い方の側面３１ａに形成
されている凹部３１ｃに溶接されている。FIG. 6 shows an example of an electrode group in a rectangular sealed battery according to the present invention. In the electrode plate group 3A, in each positive electrode plate 31, one end 34b of the positive electrode tab is welded to a concave portion 31c formed on a side surface 31a of the other end 34a of the positive electrode tab closer to the converging point J.
【００１８】このような態様で正極タブ３４を正極板３
１に溶接すると、正極タブの他端３４ａが一個所Ｊに集
められるときに、正極タブ３４に矢印Ｐ方向に沿った力
が加えられて、当該正極タブ３４が撓んだとしても、図
７に示すように、正極タブ３４の一端３４ｂの下端部
は、当該正極タブが溶接されている正極板３４に押しつ
けられるのみである。よって、当該下端部は、正極板の
凹部３１ｃを矢印Ｑ方向に押すだけであって、たとえ溶
接部で剥離しても、その下端部が隣接する負極板３２と
接触し、短絡を起こすという問題は生じなくなる。In this manner, the positive electrode tab 34 is connected to the positive electrode plate 3.
1, when the other end 34a of the positive electrode tab is gathered at one location J, even if a force is applied to the positive electrode tab 34 in the direction of the arrow P and the positive electrode tab 34 is bent, FIG. As shown in (1), the lower end of one end 34b of the positive electrode tab 34 is only pressed against the positive electrode plate 34 to which the positive electrode tab is welded. Therefore, the lower end portion only presses the concave portion 31c of the positive electrode plate in the direction of arrow Q. Even if the lower end portion is peeled off at the welded portion, the lower end portion contacts the adjacent negative electrode plate 32 and causes a short circuit. Will not occur.
【００１９】したがって、この極板群３Ａを採用し、従
来の製造工程通りに角形密閉電池を組み立てたとして
も、短絡事故の発生が極めて少ない優れた角形密閉電池
が得られる。ここで、前記極板群３Ａにおいて、例え
ば、各正極タブの他端３４ａを集束する際の力が、非常
に大きくなって、正極タブ３４に過大な力が加わった場
合、大きく屈曲した正極タブは、図７の点線の円で囲ん
だ部分Ｓでセパレータ３３を押しつぶして、隣接する負
極板３２の開口部側の端部（以下、単に上端という）３
２ａと接触することも起こりうる。このような問題の発
生を防ぐためには、例えば、図８に示すように、前記負
極板３２の上端３２ａの位置が、前記正極板３１の上端
３１ｅの位置よりも、低くなるようにすることが好まし
い。Therefore, even when this electrode plate group 3A is employed and a square sealed battery is assembled according to a conventional manufacturing process, an excellent square sealed battery with extremely few occurrences of short circuit accidents can be obtained. Here, in the electrode plate group 3A, for example, when the force at the time of converging the other end 34a of each positive electrode tab becomes extremely large, and when an excessive force is applied to the positive electrode tab 34, the positive electrode tab 34 which is greatly bent is formed. 7, the separator 33 is crushed at a portion S surrounded by a dotted circle in FIG. 7, and an end (hereinafter, simply referred to as an upper end) 3 of the adjacent negative electrode plate 32 on the opening side is pressed.
Contact with 2a can also occur. In order to prevent such a problem from occurring, for example, as shown in FIG. 8, the position of the upper end 32a of the negative electrode plate 32 may be lower than the position of the upper end 31e of the positive electrode plate 31. preferable.
【００２０】このようにすれば、仮に、正極タブの他端
３４ａを集束するときに正極タブ３４が大きく屈曲した
としても、隣接する負極板の上端３２ａが正極板の上端
３１ｅよりも下方に位置しているので、正極タブ３４と
負極板の上端３２ａとが接触することは起こりずらくな
る。よって、上述したような極板群（３Ｂ）を採用する
と、短絡の発生がより少ない優れた角形密閉電池を得る
ことができる。ここで、前記負極板の上端３２ａと正極
板の上端３１ｅとの間の上下方向における寸法の差が小
さすぎると、正極タブ３４が大きく屈曲したときに、正
極タブが負極板の上端３２ａと接触することがある。逆
に前記寸法の差が大きすぎると、負極板の上下方向の寸
法が正極板の上下方向の寸法に対して小さくなりすぎ
て、当該極板群３を長辺方向から見たときの断面形状が
櫛状になってしまい、極板群の上部において短辺方向の
強度が低下する。よって、負極板の上端３２ａと正極板
の上端３１ｅとの間の上下方向の寸法の差の大きさは、
正極タブ３４が大きく屈曲したときに、正極タブ３４と
負極板の上端３２ａとが接触してしまう大きさよりも大
きく、極板群３の短辺方向において所定の強度が確保で
きなくなる大きさよりも小さくすることが好ましい。In this way, even if the positive electrode tab 34 is largely bent when the other end 34a of the positive electrode tab is focused, the upper end 32a of the adjacent negative electrode plate is positioned below the upper end 31e of the positive electrode plate. Therefore, contact between the positive electrode tab 34 and the upper end 32a of the negative electrode plate is unlikely to occur. Therefore, when the electrode group (3B) as described above is employed, it is possible to obtain an excellent rectangular sealed battery with less occurrence of a short circuit. Here, if the vertical dimension difference between the upper end 32a of the negative electrode plate and the upper end 31e of the positive electrode plate is too small, when the positive electrode tab 34 is largely bent, the positive electrode tab contacts the upper end 32a of the negative electrode plate. May be. Conversely, if the difference between the dimensions is too large, the vertical dimension of the negative electrode plate is too small relative to the vertical dimension of the positive electrode plate, and the cross-sectional shape of the electrode plate group 3 when viewed from the long side direction Becomes comb-like, and the strength in the short side direction decreases at the upper part of the electrode group. Therefore, the magnitude of the vertical dimension difference between the upper end 32a of the negative electrode plate and the upper end 31e of the positive electrode plate is:
When the positive electrode tab 34 is largely bent, the positive electrode tab 34 is larger than the size at which the upper end 32a of the negative electrode plate contacts, and smaller than the size at which the predetermined strength cannot be secured in the short side direction of the electrode plate group 3. Is preferred.
【００２１】尚、本発明においては、正極タブの他端３
４ａの集束個所Ｊを、図６に示すように、極板群の長辺
部近傍（図中左端）に設定した場合についてのみ説明し
たが、正極タブの他端３４ａの集束個所Ｊの位置は、任
意に設定して構わない。その場合、正極タブの一端３４
ｂは、各正極板において、集束個所Ｊに近い方の側面に
溶接することが必要である。例えば、図９に示すよう
に、集束個所Ｊを、正極板３１Ａと３１Ｂとの略中間の
上方に設定した場合、それぞれの正極タブ３４の一端３
４ｂは、各正極板において、集束個所Ｊに近い方の面に
溶接される。つまり、正極板３１Ａにおいては、図中右
側の側面の凹部３１ｄに正極タブの一端３４ｂが溶接さ
れ、正極板３１Ｂ，３１Ｃにおいては、図中左側の側面
の凹部３１ｃに正極タブの一端３４ｂが溶接される。In the present invention, the other end 3 of the positive electrode tab is used.
Although only the case where the focusing point J of 4a is set near the long side of the electrode group (left end in the figure) as shown in FIG. 6, the position of the focusing point J of the other end 34a of the positive electrode tab is , May be set arbitrarily. In that case, one end 34 of the positive electrode tab
b needs to be welded to the side closer to the converging point J in each positive electrode plate. For example, as shown in FIG. 9, when the convergence point J is set substantially above the middle between the positive plates 31A and 31B, one end 3 of each positive electrode tab 34 is formed.
4b is welded to the surface closer to the converging point J in each positive electrode plate. That is, in the positive electrode plate 31A, one end 34b of the positive electrode tab is welded to the concave portion 31d on the right side surface in the drawing, and in the positive electrode plates 31B and 31C, one end 34b of the positive electrode tab is welded to the concave portion 31c on the left side surface in the drawing. Is done.
【００２２】[0022]
実施例１ 縦５０ｍｍ、横２０ｍｍ、厚さ０．５ｍｍの正極板（ニ
ッケル極）を製造した。ついで、この正極板の上部にプ
レス機により平面視形状が略正方形となる凹部３１ｃ，
３１ｄを形成し、図３に示すような、凹部を有する正極
板とした。当該凹部３１ｃ，３１ｄの寸法は、縦５ｍ
ｍ，横５ｍｍ、深さ０．１ｍｍである。次に、縦１０ｍ
ｍ、横３ｍｍ、厚さ０．１ｍｍであるニッケル製のシー
ト状の小片からなる正極タブ３４を用意し、当該正極タ
ブの一端３４ｂを、前記正極板の二つある凹部のうちの
３１ａ側の凹部３１ｃにスポット溶接した。Example 1 A positive electrode plate (nickel electrode) having a length of 50 mm, a width of 20 mm, and a thickness of 0.5 mm was manufactured. Then, a concave portion 31c having a substantially square shape in plan view is formed on the upper portion of the positive electrode plate by a press machine.
31d was formed to obtain a positive electrode plate having a concave portion as shown in FIG. The dimensions of the concave portions 31c and 31d are 5m in length.
m, width 5 mm, depth 0.1 mm. Next, length 10m
A positive electrode tab 34 made of a nickel sheet-like piece having a width of 3 mm and a width of 3 mm and a thickness of 0.1 mm is prepared, and one end 34b of the positive electrode tab is connected to the 31a side of the two concave portions of the positive electrode plate. Spot welding was performed on the concave portion 31c.
【００２３】ついで、厚さ０．１ｍｍのナイロン製のシ
ートを縦５５ｍｍ、横２４ｍｍの封筒状に成形したセパ
レータを用意し、当該セパレータの中に、正極タブを上
にして前記正極板を挿入し、正極板とセパレータとの結
合体を製造した。次に、縦５０ｍｍ、横２０ｍｍ、厚さ
０．５ｍｍの負極板（水素吸蔵合金電極）を製造した。Next, a separator is prepared by molding a nylon sheet having a thickness of 0.1 mm into an envelope shape having a length of 55 mm and a width of 24 mm, and the positive electrode plate is inserted into the separator with the positive electrode tab facing upward. Then, a combined body of the positive electrode plate and the separator was manufactured. Next, a negative electrode plate (hydrogen storage alloy electrode) having a length of 50 mm, a width of 20 mm, and a thickness of 0.5 mm was manufactured.
【００２４】以上のようにして製造した負極板を４枚と
前記結合体を３枚用意し、負極板が最外部に位置するよ
うに負極板と結合体とを交互に重ね合わせ、図６に示す
ような極板群３Ａを製造した。尚、当該極板群は、最終
的に、後述する外装缶の内側形状に適合するように、プ
レス機を用いて、縦（上下方向の寸法）５２ｍｍ、横
（長辺方向の寸法）２４ｍｍ、厚さ（短辺方向の寸法）
４．１ｍｍの略直方体状に成形した。Four negative electrode plates manufactured as described above and three of the combined bodies were prepared, and the negative electrode plate and the combined body were alternately overlapped so that the negative electrode plate was located at the outermost position. The electrode group 3A as shown was manufactured. In addition, the said electrode group finally uses a press machine so that length (vertical dimension) may be 52 mm, horizontal (dimension in a long side direction) 24 mm, so that it may match the inner shape of the outer can described later. Thickness (dimension in the short side direction)
It was shaped into a substantially rectangular parallelepiped of 4.1 mm.
【００２５】そして、図６に示すように、各正極タブの
他端３４ａを矢印Ｐ方向に引張って、極板群３Ａにおい
て図中の一番左側に位置するセパレータの上方（集束個
所Ｊ）で集束し、各正極タブの他端を溶接した。尚、集
束個所Ｊにおける溶接が終了した後、集束個所Ｊよりも
先で余った正極タブの他端は切断した。以上のようにし
て、正極タブの他端が集束された極板群を製造した。Then, as shown in FIG. 6, the other end 34a of each positive electrode tab is pulled in the direction of arrow P, and above the separator (focusing point J) located on the leftmost side in the figure in the electrode plate group 3A. It was focused and the other end of each positive electrode tab was welded. After the welding at the converging point J was completed, the other end of the positive electrode tab that was left before the converging point J was cut off. As described above, an electrode group in which the other end of the positive electrode tab was focused was manufactured.
【００２６】尚、負極板においても、各負極板の上部の
所定位置に導電性のシートの一端を溶接し、当該シート
の各他端を一個所で集束させてそれぞれを溶接した。こ
れにより、各負極板も電気的に一つにまとめられてい
る。次に、ニッケルメッキを施した厚さ０．５ｍｍの鋼
板から成り、上部に長辺方向の寸法が２５ｍｍ、短辺方
向の寸法が４．５ｍｍである矩形開口部を有し、上下方
向の寸法が６０ｍｍである直方体状の外装缶を用意し
た。そして、前記正極タブを備えた極板群３Ａを外装缶
の開口部より内部へ挿入した。引き続き、電解液とし
て、ＫＯＨを主成分とするアルカリ水溶液１ｃｃを当該
外装缶に注入した。In the negative electrode plate, one end of the conductive sheet was welded to a predetermined position on the upper part of each negative electrode plate, and the other end of the sheet was focused at one place and welded. Thereby, each negative electrode plate is also electrically united. Next, it is made of a nickel-plated steel plate having a thickness of 0.5 mm, and has a rectangular opening having a dimension of 25 mm in the long side direction and 4.5 mm in the short side direction at the top, and a dimension in the vertical direction. Was 60 mm and a rectangular parallelepiped outer can was prepared. Then, the electrode plate group 3A provided with the positive electrode tab was inserted into the outer can through the opening. Subsequently, 1 cc of an alkaline aqueous solution containing KOH as a main component was injected into the outer can as an electrolytic solution.
【００２７】ついで、中央に正極端子を備えており、長
辺方向の寸法が２５ｍｍ、短辺方向の寸法が４．５ｍ
ｍ、厚さが０．５ｍｍである蓋板の正極リード板と前記
正極タブの他端の集束個所Ｊとを溶接し、正極板と正極
端子とを電気的に接続したのち、前記蓋板を前記外装缶
の開口部に嵌合装着した。そして、当該嵌合部の全周に
わたりレーザー溶接を行い、角形密閉タイプのニッケル
−水素二次電池を製造した。尚、上記電池は、１０００
０個製造した。Next, a positive terminal is provided at the center, and the dimension in the long side direction is 25 mm and the dimension in the short side direction is 4.5 m.
m, the positive electrode lead plate of the lid plate having a thickness of 0.5 mm and the convergence point J at the other end of the positive electrode tab are welded, and the positive electrode plate and the positive electrode terminal are electrically connected. The fitting was fitted to the opening of the outer can. Then, laser welding was performed over the entire circumference of the fitting portion to produce a square sealed nickel-hydrogen secondary battery. In addition, the said battery is 1000
0 were produced.
【００２８】得られた電池に対して、短絡の発生率を求
めた。その結果を表１に示した。ここで、短絡の発生率
は、以下のようにして求めた。まず、得られた電池に対
して、充電，放電，エージングを行い、当該電池を活性
化させた後、個々の電池について開路電圧を求め、その
電圧値が規格電圧以下である電池を抜き出した。つい
で、抜き出した電池を解体し、正極タブの状態を観察
し、図５に示すように正極タブ３４の下端部がセパレー
タを突き破っているもの、あるいは、正極タブと負極板
の上端が接触しているものを短絡が発生した電池とし
て、計数した。そして、製造した電池の総数（１０００
０個）に対する短絡が発生した電池の個数の割合を求
め、この割合を短絡の発生率（％）とした。The occurrence rate of short circuit was determined for the obtained battery. The results are shown in Table 1. Here, the occurrence rate of the short circuit was obtained as follows. First, the obtained battery was charged, discharged, and aged, and after activating the battery, an open circuit voltage was obtained for each battery, and a battery having a voltage value equal to or lower than the standard voltage was extracted. Then, the removed battery is disassembled and the state of the positive electrode tab is observed, and the lower end of the positive electrode tab 34 has broken through the separator as shown in FIG. 5, or the upper end of the positive electrode tab and the negative electrode plate are in contact with each other. Are counted as batteries with a short circuit. Then, the total number of manufactured batteries (1000
0), the ratio of the number of batteries in which a short circuit occurred was determined, and this ratio was defined as a short circuit occurrence rate (%).
【００２９】実施例２ 縦４８ｍｍ、横２０ｍｍ、厚さ０．５ｍｍである負極板
を用い、極板群に組んだときに当該負極板の上端が、正
極板の上端より２ｍｍ下方に位置するようにしたことを
除いては、実施例１と同様にしてニッケル−水素二次電
池を１００００個製造した。得られた電池に対して、実
施例１と同様にして短絡の発生率を求めた。その結果を
表１に併記した。Example 2 A negative electrode plate having a length of 48 mm, a width of 20 mm, and a thickness of 0.5 mm was used. When assembled into an electrode plate group, the upper end of the negative electrode plate was positioned 2 mm below the upper end of the positive electrode plate. 10000 nickel-hydrogen secondary batteries were manufactured in the same manner as in Example 1 except that the above-described procedure was adopted. The occurrence rate of short circuit was determined for the obtained battery in the same manner as in Example 1. The results are shown in Table 1.
【００３０】比較例１ 正極タブを正極板の３１ｂ側（図３参照）、つまり、実
施例１の場合とは反対側の側面に形成した凹部３１ｄに
溶接したことを除いては、実施例１と同様にしてニッケ
ル−水素二次電池を１００００個製造した。COMPARATIVE EXAMPLE 1 The procedure of Example 1 was repeated except that the positive electrode tab was welded to the 31b side of the positive electrode plate (see FIG. 3), that is, to the recess 31d formed on the side opposite to that of Example 1. 10000 nickel-hydrogen secondary batteries were manufactured in the same manner as described above.
【００３１】得られた電池に対して、実施例１と同様に
して短絡の発生率を求めた。その結果を表１に併記し
た。The occurrence rate of short circuit was determined for the obtained battery in the same manner as in Example 1. The results are shown in Table 1.
【００３２】[0032]
【表１】 [Table 1]
【００３３】表１の結果から明らかなように、実施例１
の電池は、短絡の発生率が極めて低い。つまり、極板群
の正極タブと負極板とが接触せず、短絡の発生が少ない
良品が得られたことを示している。これは、正極タブ
を、正極板において、正極タブの他端の集束個所に近い
方の面に溶接したので、正極タブの他端を集束する際
に、正極タブに集束個所へ向かう方向に力が加えられて
も、正極タブの下端部は正極板に押しつけられるのみで
あり、負極板と正極タブとが接触することが抑制された
からである。As is clear from the results in Table 1, Example 1
Battery has a very low incidence of short circuits. In other words, this indicates that a non-defective product in which the positive electrode tab and the negative electrode plate of the electrode plate group are not in contact with each other and in which short-circuiting is less likely to be obtained. This is because the positive electrode tab is welded to the surface of the positive electrode plate that is closer to the focusing point at the other end of the positive electrode tab, so that when the other end of the positive electrode tab is focused, force is applied to the positive electrode tab in the direction toward the focusing point. Is added, only the lower end of the positive electrode tab is pressed against the positive electrode plate, and contact between the negative electrode plate and the positive electrode tab is suppressed.
【００３４】また、実施例２の電池は、実施例１の電池
よりも更に短絡の発生率が低いことがわかる。これは、
負極板の上端を正極板の上端よりも下方に位置するよう
に極板群を形成しているので、正極タブの他端を集束す
る際に、過大な力が正極タブに加わり、正極タブが大き
く屈曲しても、負極板の上端と正極タブとが接触するこ
とを防ぐことができたからである。It can also be seen that the battery of Example 2 has a lower short-circuit occurrence rate than the battery of Example 1. this is,
Since the electrode plate group is formed so that the upper end of the negative electrode plate is located below the upper end of the positive electrode plate, when the other end of the positive electrode tab is focused, excessive force is applied to the positive electrode tab, and the positive electrode tab is This is because, even if bent greatly, it was possible to prevent the upper end of the negative electrode plate from contacting the positive electrode tab.
【００３５】それに対し、比較例１の電池は、本発明の
電池に比べ、短絡の発生率が高くなっている。これは、
比較例１の電池においては、従来の極板群を採用してい
るので、正極タブの他端を集束する際に、正極タブに力
が加わり、それにともなって、正極タブが大きく撓み、
正極タブの下端部の溶接部がはずれてしまい、当該下端
部が隣接するセパレータを突き破って、その先の負極板
に接触したためである。On the other hand, the battery of Comparative Example 1 has a higher short-circuit occurrence rate than the battery of the present invention. this is,
In the battery of Comparative Example 1, since the conventional electrode group was employed, when the other end of the positive electrode tab was focused, a force was applied to the positive electrode tab, and the positive electrode tab was greatly bent,
This is because the welded portion at the lower end of the positive electrode tab was dislodged, and the lower end pierced the adjacent separator and came into contact with the negative electrode plate ahead.
【００３６】[0036]
【発明の効果】請求項１の角形密閉電池は、外装缶の内
部に収容される極板群において、正極タブを、各正極板
における正極タブの他端の集束個所に近い方の面に溶接
しているので、正極タブの他端を集束する際に、正極タ
ブに力が加えられ、正極タブが大きく撓んだとしても、
正極タブの下端部は、当該正極タブが溶接されている正
極板に押しつけられるだけなので、隣接するセパレータ
を突き破って負極板と接触することは避けられる。よっ
て、負極板と正極タブとが短絡するということは抑えら
れるので、短絡事故による不良品の発生は極めて少なく
なり、電池製造における歩留まりは向上する。According to the first aspect of the present invention, the positive electrode tab is welded to a surface of the electrode plate group housed in the outer can that is closer to the converging point at the other end of the positive electrode tab in each positive electrode plate. Therefore, when focusing the other end of the positive electrode tab, even if a force is applied to the positive electrode tab and the positive electrode tab is largely bent,
Since the lower end of the positive electrode tab is only pressed against the positive electrode plate to which the positive electrode tab is welded, it is possible to avoid breaking through the adjacent separator and coming into contact with the negative electrode plate. Therefore, a short circuit between the negative electrode plate and the positive electrode tab is suppressed, so that the occurrence of defective products due to a short circuit accident is extremely reduced, and the yield in battery production is improved.
【００３７】請求項２の角形密閉電池は、極板群におい
て、負極板の上端を正極板の上端よりも下方に位置する
ように組み立てているので、正極タブの他端を集束する
際に、正極タブに過大な力が加えられて、当該正極タブ
が大きく屈曲したとしても、隣接する負極板の上端と接
触し短絡することは極力抑えられる。よって、短絡事故
による不良品の発生はより少なくなる。In the prismatic sealed battery according to the second aspect, in the electrode plate group, the upper end of the negative electrode plate is assembled so as to be located lower than the upper end of the positive electrode plate. Even if an excessive force is applied to the positive electrode tab and the positive electrode tab is greatly bent, contact with the upper end of the adjacent negative electrode plate and short circuit are suppressed as much as possible. Therefore, occurrence of defective products due to a short circuit accident is further reduced.
【図１】角形密閉電池の構成を示す斜視図である。FIG. 1 is a perspective view showing a configuration of a rectangular sealed battery.
【図２】極板群の構成を示す斜視図である。FIG. 2 is a perspective view illustrating a configuration of an electrode group.
【図３】正極板の構成を示す斜視図である。FIG. 3 is a perspective view showing a configuration of a positive electrode plate.
【図４】図２のＩＶ−ＩＶ線に沿う断面図である。FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2;
【図５】従来の極板群における正極タブの取付け部の構
成を示す断面図である。FIG. 5 is a cross-sectional view showing a configuration of a mounting portion for a positive electrode tab in a conventional electrode plate group.
【図６】本発明における極板群の構成を示す断面図であ
る。FIG. 6 is a cross-sectional view showing a configuration of an electrode group according to the present invention.
【図７】本発明における極板群の正極タブの取付け部の
構成を示す断面図である。FIG. 7 is a cross-sectional view illustrating a configuration of a mounting portion of a positive electrode tab of an electrode plate group according to the present invention.
【図８】本発明における極板群の別な態様の正極タブの
取付け部の構成を示す断面図である。FIG. 8 is a cross-sectional view showing a configuration of a mounting portion of a positive electrode tab of another embodiment of the electrode plate group according to the present invention.
【図９】本発明における極板群の構成の別な態様を示す
断面図である。FIG. 9 is a cross-sectional view showing another embodiment of the configuration of the electrode group in the present invention.
１ 外装缶 １ａ 開口部 ２ 蓋板 ２１ 正極端子 ３ 極板群（従来の） ３Ａ 極板群（本発明における） ３１ 正極板 ３１ａ、３１ｂ 側面 ３１ｃ，３１ｄ 凹部 ３２ 負極板 ３３ セパレータ ３４ 正極タブ ３４ａ 正極タブの他端 ３４ｂ 正極タブの一端 Ｊ 集束個所 Reference Signs List 1 outer can 1a opening 2 lid plate 21 positive electrode terminal 3 electrode plate group (conventional) 3A electrode plate group (in the present invention) 31 positive electrode plate 31a, 31b side surface 31c, 31d concave portion 32 negative electrode plate 33 separator 34 positive electrode tab 34a positive electrode The other end of the tab 34b One end of the positive electrode tab J Focusing point
Claims (2)
に、アルカリ電解液とともに、負極板と一方の側面に正
極タブの一端が取付けられた正極板とがセパレータを介
して多数配置されて一体化された極板群が収容され、前
記矩形開口部が正極端子を有する蓋板で密閉され、か
つ、前記各正極タブの他端が一個所に集束されて前記正
極端子と接続されている角形密閉電池において、 前記正極タブの一端は、前記正極板の側面のうち前記各
正極タブの他端の集束個所に近い方の側面に取付けられ
ていることを特徴とする角形密閉電池。1. A negative electrode plate and a large number of positive electrode plates having one end of a positive electrode tab attached to one side surface, together with an alkaline electrolyte, are arranged via a separator in a bottomed outer can having a rectangular opening. The integrated electrode plate group is accommodated, the rectangular opening is sealed with a cover plate having a positive electrode terminal, and the other end of each of the positive electrode tabs is focused at one location and connected to the positive electrode terminal. The sealed rectangular battery according to claim 1, wherein one end of the positive electrode tab is attached to a side surface of the side surface of the positive electrode plate which is closer to a focusing point at the other end of each of the positive electrode tabs.
極板の開口部側の端部よりも、外装缶の底部側に位置し
ている請求項１の角形密閉電池。2. The sealed rectangular battery according to claim 1, wherein the end of the negative electrode plate on the opening side is located closer to the bottom of the outer can than the end of the positive electrode plate on the opening side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7192069A JP2949567B2 (en) | 1995-07-27 | 1995-07-27 | Prismatic sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7192069A JP2949567B2 (en) | 1995-07-27 | 1995-07-27 | Prismatic sealed battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0945308A JPH0945308A (en) | 1997-02-14 |
| JP2949567B2 true JP2949567B2 (en) | 1999-09-13 |
Family
ID=16285118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7192069A Expired - Lifetime JP2949567B2 (en) | 1995-07-27 | 1995-07-27 | Prismatic sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2949567B2 (en) |
-
1995
- 1995-07-27 JP JP7192069A patent/JP2949567B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0945308A (en) | 1997-02-14 |
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